Analog front end non-linear model estimation

Abstract

Certain aspects of the present disclosure provide techniques for analog front end (AFE) non-linear model estimation. An example method includes transmitting a first message including a request for a second wireless communications device to transmit a signal to the first wireless communications device, receiving, from the second wireless communications device, the signal based on the first message, determining a non-linear model of an AFE of the first wireless communications device based on the signal received from the second wireless communications device, and taking one or more actions based on the determined non-linear model of the AFE.

Description

ANALOG FRONT END NON-LINEAR MODEL ESTIMATIONCROSS-REFERENCE TO RELATED APPLICATION(S)

[0001] This application claims benefit and priority to Israel Patent Application No. 305603, filed August 31, 2023, which is hereby incorporated by reference herein in its entirety.BACKGROUNDField of the Disclosure

[0002] Aspects of the present disclosure relate to wireless communications, and more particularly, to techniques for estimating a non-linear model of an analog front end (AFE) of a wireless communications device.Description of Related Art

[0003] Wireless communications systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, broadcasts, or other similar types of services. These wireless communications systems may employ multiple-access technologies capable of supporting communications with multiple users by sharing available wireless communications system resources with those users

[0004] Although wireless communications systems have made great technological advancements over many years, challenges still exist. For example, complex and dynamic environments can still attenuate or block signals between wireless transmitters and wireless receivers. Accordingly, there is a continuous desire to improve the technical performance of wireless communications systems, including, for example: improving speed and data carrying capacity of communications, improving efficiency of the use of shared communications mediums, reducing power used by transmitters and receivers while performing communications, improving reliability of wireless communications, avoiding redundant transmissions and / or receptions and related processing, improving the coverage area of wireless communications, increasing the number and types of devices that can access wireless communications systems, increasing the ability for different types of devices to intercommunicate, increasing the number and type of wireless communications mediums available for use, and the like. Consequently, there exists a need for further improvements in wireless communications systems to overcome the aforementioned technical challenges and others.SUMMARY

[0005] One aspect provides a method for wireless communication by a first wireless communications device. The method includes transmitting a first message including a request for a second wireless communications device to transmit a signal to the first wireless communications device; receiving, from the second wireless communications device, the signal based on the first message; determining a non-linear model of an analog front end (AFE) of the first wireless communications device based on the signal received from the second wireless communications device; and taking one or more actions based on the determined non-linear model of the AFE.

[0006] Another aspect provides a method for wireless communication by a second wireless communications device. The method includes receiving a first message including a request for the second wireless communications device to transmit a signal to a first wireless communications device, wherein the first message includes one or more parameters for the second wireless communications device to use to transmit the signal to the first wireless communications device, and the one or more parameters include a non-linear (NL) transmission (TX) floor for the signal; and transmitting, to the first wireless communications device, the signal based on the first message and the one or more parameters.

[0007] Another aspect provides a method for wireless communication by a network entity. The method includes receiving, from a first wireless communications device, a first message including a request for a second wireless communications device to transmit a signal to the first wireless communications device; and transmitting, to the second wireless communications device, a second message including the request for the second wireless communications device to transmit the signal to the first wireless communications device and one or more parameters for the second wireless communications device to use to transmit the signal to the first wireless communications device, wherein the one or more parameters include at least a non-linear (NL) transmission (TX) floor for the signal.

[0008] Other aspects provide: an apparatus operable, configured, or otherwise adapted to perform any one or more of the aforementioned methods and / or those described elsewhere herein; a non-transitory, computer-readable media comprising instructions that, when executed by a processor of an apparatus, cause the apparatus toperform the aforementioned methods as well as those described elsewhere herein; a computer program product embodied on a computer-readable storage medium comprising code for performing the aforementioned methods as well as those described elsewhere herein; and / or an apparatus comprising means for performing the aforementioned methods as well as those described elsewhere herein. By way of example, an apparatus may comprise a processing system, a device with a processing system, or processing systems cooperating over one or more networks.

[0009] The following description and the appended figures set forth certain features for purposes of illustration.BRIEF DESCRIPTION OF DRAWINGS

[0010] The appended figures depict certain features of the various aspects described herein and are not to be considered limiting of the scope of this disclosure.

[0011] FIG. 1 depicts an example wireless communications network.

[0012] FIG. 2 depicts an example disaggregated base station architecture.

[0013] FIG. 3 depicts aspects of an example base station and an example user equipment.

[0014] FIGS. 4A, 4B, 4C, and 4D depict various example aspects of data structures for a wireless communications network.

[0015] FIG. 5 illustrates example components of a transceiver front end of a first wireless communications device.

[0016] FIGS. 6A and 6B illustrate different scenarios in which intermodulation distortion may occur based on the transmission of the one or more blocker signals.

[0017] FIG. 7 illustrates a receive chain of a user equipment.

[0018] FIG. 8 depicts a process flow for communications in a network between a first wireless communications device and a second wireless communications device.

[0019] FIG. 9 depicts a process flow for communications in a network between a first wireless communications device, a second wireless communications device, and a network entity.

[0020] FIG. 10 depicts a method for wireless communications.

[0021] FIG. 11 depicts a method for wireless communications.

[0022] FIG. 12 depicts a method for wireless communications.

[0023] FIG. 13 depicts aspects of an example communications device.

[0024] FIG. 14 depicts aspects of an example communications device.

[0025] FIG. 15 depicts aspects of an example communications device.DETAILED DESCRIPTION

[0026] Aspects of the present disclosure provide apparatuses, methods, processing systems, and computer-readable mediums for estimating a non-linear model of an analog front end (AFE) of a wireless communications device.

[0027] For example, in some cases, when receiving one or more data signals intended for a first wireless communications device, the first wireless communications device may also receive external interference caused by one or more blocker signals that are received concurrently with the one or more data signals in a composite analog wireless signal. In some cases, this external interference caused by the one or more blocker signals may lead to several negative effects at the first wireless communications device. For example, in some cases, energy received from the one or more blocker signals due to their transmission power (or power at which they are transmitted) may interact with the one or more data signals intended for the first wireless communications device causing additional signals at frequencies that are the sum or difference of the original frequencies of the blocker signals and data signals to be created.

[0028] These additional signals, known as intermodulation products, may cause intermodulation distortion within the first wireless communications device that may force certain components in a receive chain of the first wireless communications device into saturation (e.g., due to certain non-linear characteristics associated with these components). The saturation of these components may reduce a signal to noise ratio (SNR) associated with the one or more data signals intended for the first wireless communications device, which may result in the first wireless communications device being unable to properly decode the one or more data signals. The first wireless communications device would then be forced to transmit feedback information, requesting the one or more data signals be retransmitted, unnecessarily wasting time-frequency resources within a network and power resources at the first wireless communications device.

[0029] In some cases, one way to remove or reduce the intermodulation distortion caused by the one or more blocker signals may be to use a linearizer module to remove or mitigate the non-linear characteristics of the certain components of the first wireless communications device, such as an analog front end (AFE), as well as non-linear effects caused to received signals. For example, in some cases, the linearizer module may be configured to determine or estimate a non-linearity model or function of the AFE of the first wireless communications device and remove or mitigate the non-linear effects on received signals based on the non-linear model, for example, by applying a correction model (e.g., an inverse of the non-linear model or some other function). As such, proper determination / estimation of the non-linear model of the AFE is crucial to ensure that the linearizer module is able to remove or at least reduce the non-linear effects. Without proper determination / estimation of the non-linear model, the first wireless communications device may not be able to properly remove or mitigate the non-linear effects of the AFE, which may cause the first wireless communications device to not properly receive and decode signals intended for the first wireless communications device.

[0030] Accordingly, aspects of the present disclosure provide techniques for determining or estimating a non-linear model a first wireless communications device to allow the first wireless communications device to properly remove or mitigate the nonlinear effects of the AFE on received signals described above. For example, in some cases, these techniques may involve far-field training in which a second wireless communications device is used to transmit a known or pre-configured signal to the first wireless communications device that enables the first wireless communications device to determine or estimate a non-linear model of the AFE. The first wireless communications device may then apply a correction model, based on the determined non-linear model, to linearize a non-linear response of the AFE, which may improve system performance by increasing an effective dynamic range of the AFE and allow the first wireless communications device to remove distortions in received signals, such as IM3 distortion. By increasing the effective dynamic range of the AFE and removing distortions in the received signals, the first wireless communications device may avoid the unnecessaryconsumption of additional time-frequency resources and power resources described above.Introduction to Wireless Communications Networks

[0031] The techniques and methods described herein may be used for various wireless communications networks. While aspects may be described herein using terminology commonly associated with 3G, 4G, and / or 5G wireless technologies, aspects of the present disclosure may likewise be applicable to other communications systems and standards not explicitly mentioned herein.

[0032] FIG. 1 depicts an example of a wireless communications network 100, in which aspects described herein may be implemented.

[0033] Generally, wireless communications network 100 includes various network entities (alternatively, network elements or network nodes). A network entity is generally a communications device and / or a communications function performed by a communications device (e.g., a user equipment (UE), a base station (BS), a component of a BS, a server, etc.). For example, various functions of a network as well as various devices associated with and interacting with a network may be considered network entities. Further, wireless communications network 100 includes terrestrial aspects, such as ground-based network entities (e.g., BSs 102), and non-terrestrial aspects, such as satellite 140 and aircraft 145, which may include network entities on-board (e.g., one or more BSs) capable of communicating with other network elements (e.g., terrestrial BSs) and user equipments.

[0034] In the depicted example, wireless communications network 100 includes BSs 102, UEs 104, and one or more core networks, such as an Evolved Packet Core (EPC) 160 and 5G Core (5GC) network 190, which interoperate to provide communications services over various communications links, including wired and wireless links.

[0035] FIG. 1 depicts various example UEs 104, which may more generally include: a cellular phone, smart phone, session initiation protocol (SIP) phone, laptop, personal digital assistant (PDA), satellite radio, global positioning system, multimedia device, video device, digital audio player, camera, game console, tablet, smart device, wearable device, vehicle, electric meter, gas pump, large or small kitchen appliance, healthcare device, implant, sensor / actuator, display, internet of things (loT) devices, always on (AON) devices, edge processing devices, or other similar devices. UEs 104 may also bereferred to more generally as a mobile device, a wireless device, a wireless communications device, a station, a mobile station, a subscriber station, a mobile subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a remote device, an access terminal, a mobile terminal, a wireless terminal, a remote terminal, a handset, and others.

[0036] BSs 102 wirelessly communicate with (e.g., transmit signals to or receive signals from) UEs 104 via communications links 120. The communications links 120 between BSs 102 and UEs 104 may include uplink (UL) (also referred to as reverse link) transmissions from a UE 104 to a BS 102 and / or downlink (DL) (also referred to as forward link) transmissions from a BS 102 to a UE 104. The communications links 120 may use multiple-input and multiple-output (MIMO) antenna technology, including spatial multiplexing, beamforming, and / or transmit diversity in various aspects.

[0037] BSs 102 may generally include: a NodeB, enhanced NodeB (eNB), next generation enhanced NodeB (ng-eNB), next generation NodeB (gNB or gNodeB), access point, base transceiver station, radio base station, radio transceiver, transceiver function, transmission reception point, and / or others. Each of BSs 102 may provide communications coverage for a respective geographic coverage area 110, which may sometimes be referred to as a cell, and which may overlap in some cases (e.g., small cell 102’ may have a coverage area 110’ that overlaps the coverage area 110 of a macro cell). A BS may, for example, provide communications coverage for a macro cell (covering relatively large geographic area), a pico cell (covering relatively smaller geographic area, such as a sports stadium), a femto cell (relatively smaller geographic area (e.g., a home)), and / or other types of cells.

[0038] While BSs 102 are depicted in various aspects as unitary communications devices, BSs 102 may be implemented in various configurations. For example, one or more components of a base station may be disaggregated, including a central unit (CU), one or more distributed units (DUs), one or more radio units (RUs), a Near-Real Time (Near-RT) RAN Intelligent Controller (RIC), or a Non-Real Time (Non-RT) RIC, to name a few examples. In another example, various aspects of a base station may be virtualized. More generally, a base station (e.g., BS 102) may include components that are located at a single physical location or components located at various physical locations. In examples in which a base station includes components that are located at various physical locations, the various components may each perform functions such that,collectively, the various components achieve functionality that is similar to a base station that is located at a single physical location. In some aspects, a base station including components that are located at various physical locations may be referred to as a disaggregated radio access network architecture, such as an Open RAN (O-RAN) or Virtualized RAN (VRAN) architecture. FIG. 2 depicts and describes an example disaggregated base station architecture.

[0039] Different BSs 102 within wireless communications network 100 may also be configured to support different radio access technologies, such as 3G, 4G, and / or 5G. For example, BSs 102 configured for 4G LTE (collectively referred to as Evolved Universal Mobile Telecommunications System (UMTS) Terrestrial Radio Access Network (E- UTRAN)) may interface with the EPC 160 through first backhaul links 132 (e.g., an SI interface). BSs 102 configured for 5G (e.g., 5G NR or Next Generation RAN (NG-RAN)) may interface with 5GC 190 through second backhaul links 184. BSs 102 may communicate directly or indirectly (e.g., through the EPC 160 or 5GC 190) with each other over third backhaul links 134 (e.g., X2 interface), which may be wired or wireless.

[0040] Wireless communications network 100 may subdivide the electromagnetic spectrum into various classes, bands, channels, or other features. In some aspects, the subdivision is provided based on wavelength and frequency, where frequency may also be referred to as a carrier, a subcarrier, a frequency channel, a tone, or a subband. For example, 3GPP currently defines Frequency Range 1 (FR1) as including 410 MHz - 7125 MHz, which is often referred to (interchangeably) as “Sub-6 GHz”. Similarly, 3GPP currently defines Frequency Range 2 (FR2) as including 24,250 MHz - 71,000 MHz, which is sometimes referred to (interchangeably) as a “millimeter wave” (“mmW” or “mmWave”). In some cases, FR2 may be further defined in terms of sub-ranges, such as a first sub-range FR2-1 including 24,250 MHz - 52,600 MHz and a second sub-range FR2-2 including 52,600 MHz - 71,000 MHz. A base station configured to communicate using mmWave / near mmWave radio frequency bands (e.g., a mmWave base station such as BS 180) may utilize beamforming (e.g., 182) with a UE (e.g., 104) to improve path loss and range.

[0041] The communications links 120 between BSs 102 and, for example, UEs 104, may be through one or more carriers, which may have different bandwidths (e.g., 5, 10, 15, 20, 100, 400, and / or other MHz), and which may be aggregated in various aspects. Carriers may or may not be adjacent to each other. Allocation of carriers may beasymmetric with respect to DL and UL (e.g., more or fewer carriers may be allocated for DL than for UL).

[0042] Communications using higher frequency bands may have higher path loss and a shorter range compared to lower frequency communications. Accordingly, certain base stations (e.g., 180 in FIG. 1) may utilize beamforming 182 with a UE 104 to improve path loss and range. For example, BS 180 and the UE 104 may each include a plurality of antennas, such as antenna elements, antenna panels, and / or antenna arrays to facilitate the beamforming. In some cases, BS 180 may transmit a beamformed signal to UE 104 in one or more transmit directions 182’. UE 104 may receive the beamformed signal from the BS 180 in one or more receive directions 182”. UE 104 may also transmit a beamformed signal to the BS 180 in one or more transmit directions 182”. BS 180 may also receive the beamformed signal from UE 104 in one or more receive directions 182’. BS 180 and UE 104 may then perform beam training to determine the best receive and transmit directions for each of BS 180 and UE 104. Notably, the transmit and receive directions for BS 180 may or may not be the same. Similarly, the transmit and receive directions for UE 104 may or may not be the same.

[0043] Wireless communications network 100 further includes a Wi-Fi AP 150 in communication with Wi-Fi stations (STAs) 152 via communications links 154 in, for example, a 2.4 GHz and / or 5 GHz unlicensed frequency spectrum.

[0044] Certain UEs 104 may communicate with each other using device-to-device (D2D) communications link 158. D2D communications link 158 may use one or more sidelink channels, such as a physical sidelink broadcast channel (PSBCH), a physical sidelink discovery channel (PSDCH), a physical sidelink shared channel (PSSCH), a physical sidelink control channel (PSCCH), and / or a physical sidelink feedback channel (PSFCH).

[0045] EPC 160 may include various functional components, including: a Mobility Management Entity (MME) 162, other MMEs 164, a Serving Gateway 166, a Multimedia Broadcast Multicast Service (MBMS) Gateway 168, a Broadcast Multicast Service Center (BM-SC) 170, and / or a Packet Data Network (PDN) Gateway 172, such as in the depicted example. MME 162 may be in communication with a Home Subscriber Server (HSS) 174. MME 162 is the control node that processes the signaling between the UEs 104 and the EPC 160. Generally, MME 162 provides bearer and connection management.

[0046] Generally, user Internet protocol (IP) packets are transferred through Serving Gateway 166, which itself is connected to PDN Gateway 172. PDN Gateway 172 provides UE IP address allocation as well as other functions. PDN Gateway 172 and the BM-SC 170 are connected to IP Services 176, which may include, for example, the Internet, an intranet, an IP Multimedia Subsystem (IMS), a Packet Switched (PS) streaming service, and / or other IP services.

[0047] BM-SC 170 may provide functions for MBMS user service provisioning and delivery. BM-SC 170 may serve as an entry point for content provider MBMS transmission, may be used to authorize and initiate MBMS Bearer Services within a public land mobile network (PLMN), and / or may be used to schedule MBMS transmissions. MBMS Gateway 168 may be used to distribute MBMS traffic to the BSs 102 belonging to a Multicast Broadcast Single Frequency Network (MBSFN) area broadcasting a particular service, and / or may be responsible for session management (start / stop) and for collecting eMBMS related charging information.

[0048] 5GC 190 may include various functional components, including: an Access and Mobility Management Function (AMF) 192, other AMFs 193, a Session Management Function (SMF) 194, and a User Plane Function (UPF) 195. AMF 192 may be in communication with Unified Data Management (UDM) 196.

[0049] AMF 192 is a control node that processes signaling between UEs 104 and 5GC 190. AMF 192 provides, for example, quality of service (QoS) flow and session management.

[0050] Internet protocol (IP) packets are transferred through UPF 195, which is connected to the IP Services 197, and which provides UE IP address allocation as well as other functions for 5GC 190. IP Services 197 may include, for example, the Internet, an intranet, an IMS, a PS streaming service, and / or other IP services.

[0051] In various aspects, a network entity or network node can be implemented as an aggregated base station, as a disaggregated base station, a component of a base station, an integrated access and backhaul (IAB) node, a relay node, a sidelink node, to name a few examples.

[0052] FIG. 2 depicts an example disaggregated base station 200 architecture. The disaggregated base station 200 architecture may include one or more central units (CUs) 210 that can communicate directly with a core network 220 via a backhaul link, orindirectly with the core network 220 through one or more disaggregated base station units (such as a Near-Real Time (Near-RT) RAN Intelligent Controller (RIC) 225 via an E2 link, or a Non-Real Time (Non-RT) RIC 215 associated with a Service Management and Orchestration (SMO) Framework 205, or both). A CU 210 may communicate with one or more distributed units (DUs) 230 via respective midhaul links, such as an Fl interface. The DUs 230 may communicate with one or more radio units (RUs) 240 via respective fronthaul links. The RUs 240 may communicate with respective UEs 104 via one or more radio frequency (RF) access links. In some implementations, the UE 104 may be simultaneously served by multiple RUs 240.

[0053] Each of the units, e.g., the CUs 210, the DUs 230, the RUs 240, as well as the Near-RT RICs 225, the Non-RT RICs 215 and the SMO Framework 205, may include one or more interfaces or be coupled to one or more interfaces configured to receive or transmit signals, data, or information (collectively, signals) via a wired or wireless transmission medium. Each of the units, or an associated processor or controller providing instructions to the communications interfaces of the units, can be configured to communicate with one or more of the other units via the transmission medium. For example, the units can include a wired interface configured to receive or transmit signals over a wired transmission medium to one or more of the other units. Additionally or alternatively, the units can include a wireless interface, which may include a receiver, a transmitter or transceiver (such as a radio frequency (RF) transceiver), configured to receive or transmit signals, or both, over a wireless transmission medium to one or more of the other units.

[0054] In some aspects, the CU 210 may host one or more higher layer control functions. Such control functions can include radio resource control (RRC), packet data convergence protocol (PDCP), service data adaptation protocol (SDAP), or the like. Each control function can be implemented with an interface configured to communicate signals with other control functions hosted by the CU 210. The CU 210 may be configured to handle user plane functionality (e.g., Central Unit - User Plane (CU-UP)), control plane functionality (e.g., Central Unit - Control Plane (CU-CP)), or a combination thereof. In some implementations, the CU 210 can be logically split into one or more CU-UP units and one or more CU-CP units. The CU-UP unit can communicate bidirectionally with the CU-CP unit via an interface, such as the El interface when implemented in an O-RANconfiguration. The CU 210 can be implemented to communicate with the DU 230, as necessary, for network control and signaling.

[0055] The DU 230 may correspond to a logical unit that includes one or more base station functions to control the operation of one or more RUs 240. In some aspects, the DU 230 may host one or more of a radio link control (RLC) layer, a medium access control (MAC) layer, and one or more high physical (PHY) layers (such as modules for forward error correction (FEC) encoding and decoding, scrambling, modulation and demodulation, or the like) depending, at least in part, on a functional split, such as those defined by the 3rdGeneration Partnership Project (3GPP). In some aspects, the DU 230 may further host one or more low PHY layers. Each layer (or module) can be implemented with an interface configured to communicate signals with other layers (and modules) hosted by the DU 230, or with the control functions hosted by the CU 210.

[0056] Lower-layer functionality can be implemented by one or more RUs 240. In some deployments, an RU 240, controlled by a DU 230, may correspond to a logical node that hosts RF processing functions, or low-PHY layer functions (such as performing fast Fourier transform (FFT), inverse FFT (iFFT), digital beamforming, physical random access channel (PRACH) extraction and filtering, or the like), or both, based at least in part on the functional split, such as a lower layer functional split. In such an architecture, the RU(s) 240 can be implemented to handle over the air (OTA) communications with one or more UEs 104. In some implementations, real-time and non-real-time aspects of control and user plane communications with the RU(s) 240 can be controlled by the corresponding DU 230. In some scenarios, this configuration can enable the DU(s) 230 and the CU 210 to be implemented in a cloud-based RAN architecture, such as a vRAN architecture.

[0057] The SMO Framework 205 may be configured to support RAN deployment and provisioning of non-virtualized and virtualized network elements. For non-virtualized network elements, the SMO Framework 205 may be configured to support the deployment of dedicated physical resources for RAN coverage requirements which may be managed via an operations and maintenance interface (such as an 01 interface). For virtualized network elements, the SMO Framework 205 may be configured to interact with a cloud computing platform (such as an open cloud (O-Cloud) 290) to perform network element life cycle management (such as to instantiate virtualized network elements) via a cloud computing platform interface (such as an 02 interface). Suchvirtualized network elements can include, but are not limited to, CUs 210, DUs 230, RUs 240 and Near-RT RICs 225. In some implementations, the SMO Framework 205 can communicate with a hardware aspect of a 4G RAN, such as an open eNB (O-eNB) 211, via an 01 interface. Additionally, in some implementations, the SMO Framework 205 can communicate directly with one or more RUs 240 via an 01 interface. The SMO Framework 205 also may include a Non-RT RIC 215 configured to support functionality of the SMO Framework 205.

[0058] The Non-RT RIC 215 may be configured to include a logical function that enables non-real-time control and optimization of RAN elements and resources, Artificial Intelligence / Machine Learning (AI / ML) workflows including model training and updates, or policy -based guidance of applications / features in the Near-RT RIC 225. The Non-RT RIC 215 may be coupled to or communicate with (such as via an Al interface) the Near-RT RIC 225. The Near-RT RIC 225 may be configured to include a logical function that enables near-real-time control and optimization of RAN elements and resources via data collection and actions over an interface (such as via an E2 interface) connecting one or more CUs 210, one or more DUs 230, or both, as well as an O-eNB, with the Near-RT RIC 225.

[0059] In some implementations, to generate AI / ML models to be deployed in the Near-RT RIC 225, the Non-RT RIC 215 may receive parameters or external enrichment information from external servers. Such information may be utilized by the Near-RT RIC 225 and may be received at the SMO Framework 205 or the Non-RT RIC 215 from nonnetwork data sources or from network functions. In some examples, the Non-RT RIC 215 or the Near-RT RIC 225 may be configured to tune RAN behavior or performance. For example, the Non-RT RIC 215 may monitor long-term trends and patterns for performance and employ AI / ML models to perform corrective actions through the SMO Framework 205 (such as reconfiguration via 01) or via creation of RAN management policies (such as Al policies).

[0060] FIG. 3 depicts aspects of an example BS 102 and a UE 104.

[0061] Generally, BS 102 includes various processors (e.g., 320, 330, 338, and 340), antennas 334a-t (collectively 334), transceivers 332a-t (collectively 332), which include modulators and demodulators, and other aspects, which enable wireless transmission of data (e.g., data source 312) and wireless reception of data (e.g., data sink 339). Forexample, BS 102 may send and receive data between BS 102 and UE 104. BS 102 includes controller / processor 340, which may be configured to implement various functions described herein related to wireless communications.

[0062] Generally, UE 104 includes various processors (e.g., 358, 364, 366, and 380), antennas 352a-r (collectively 352), transceivers 354a-r (collectively 354), which include modulators and demodulators, and other aspects, which enable wireless transmission of data (e.g., retrieved from data source 362) and wireless reception of data (e.g., provided to data sink 360). UE 104 includes controller / processor 380, which may be configured to implement various functions described herein related to wireless communications.

[0063] In regards to an example downlink transmission, BS 102 includes a transmit processor 320 that may receive data from a data source 312 and control information from a controller / processor 340. The control information may be for the physical broadcast channel (PBCH), physical control format indicator channel (PCFICH), physical HARQ indicator channel (PHICH), physical downlink control channel (PDCCH), group common PDCCH (GC PDCCH), and / or others. The data may be for the physical downlink shared channel (PDSCH), in some examples.

[0064] Transmit processor 320 may process (e.g., encode and symbol map) the data and control information to obtain data symbols and control symbols, respectively. Transmit processor 320 may also generate reference symbols, such as for the primary synchronization signal (PSS), secondary synchronization signal (SSS), PBCH demodulation reference signal (DMRS), and channel state information reference signal (CSI-RS).

[0065] Transmit (TX) multiple-input multiple-output (MIMO) processor 330 may perform spatial processing (e.g., precoding) on the data symbols, the control symbols, and / or the reference symbols, if applicable, and may provide output symbol streams to the modulators (MODs) in transceivers 332a-332t. Each modulator in transceivers 332a- 332t may process a respective output symbol stream to obtain an output sample stream. Each modulator may further process (e.g., convert to analog, amplify, filter, and upconvert) the output sample stream to obtain a downlink signal. Downlink signals from the modulators in transceivers 332a-332t may be transmitted via the antennas 334a-334t, respectively.

[0066] In order to receive the downlink transmission, UE 104 includes antennas 352a- 352r that may receive the downlink signals from the BS 102 and may provide received signals to the demodulators (DEMODs) in transceivers 354a-354r, respectively. Each demodulator in transceivers 354a-354r may condition (e.g., filter, amplify, downconvert, and digitize) a respective received signal to obtain input samples. Each demodulator may further process the input samples to obtain received symbols.

[0067] MIMO detector 356 may obtain received symbols from all the demodulators in transceivers 354a-354r, perform MIMO detection on the received symbols if applicable, and provide detected symbols. Receive processor 358 may process (e.g., demodulate, deinterleave, and decode) the detected symbols, provide decoded data for the UE 104 to a data sink 360, and provide decoded control information to a controller / processor 380.

[0068] In regards to an example uplink transmission, UE 104 further includes a transmit processor 364 that may receive and process data (e.g., for the PUSCH) from a data source 362 and control information (e.g., for the physical uplink control channel (PUCCH)) from the controller / processor 380. Transmit processor 364 may also generate reference symbols for a reference signal (e.g., for the sounding reference signal (SRS). The symbols from the transmit processor 364 may be precoded by a TX MIMO processor 366 if applicable, further processed by the modulators in transceivers 354a-354r (e.g., for SC-FDM), and transmitted to BS 102.

[0069] At BS 102, the uplink signals from UE 104 may be received by antennas 334a- t, processed by the demodulators in transceivers 332a-332t, detected by a MIMO detector 336 if applicable, and further processed by a receive processor 338 to obtain decoded data and control information sent by UE 104. Receive processor 338 may provide the decoded data to a data sink 339 and the decoded control information to the controller / processor 340.

[0070] Memories 342 and 382 may store data and program codes for BS 102 and UE 104, respectively.

[0071] Scheduler 344 may schedule UEs for data transmission on the downlink and / or uplink.

[0072] In various aspects, BS 102 may be described as transmitting and receiving various types of data associated with the methods described herein. In these contexts,“transmitting” may refer to various mechanisms of outputting data, such as outputting data from data source 312, scheduler 344, memory 342, transmit processor 320, controller / processor 340, TX MIMO processor 330, transceivers 332a-t, antenna 334a-t, and / or other aspects described herein. Similarly, “receiving” may refer to various mechanisms of obtaining data, such as obtaining data from antennas 334a-t, transceivers 332a-t, RX MIMO detector 336, controller / processor 340, receive processor 338, scheduler 344, memory 342, and / or other aspects described herein.

[0073] In various aspects, UE 104 may likewise be described as transmitting and receiving various types of data associated with the methods described herein. In these contexts, “transmitting” may refer to various mechanisms of outputting data, such as outputting data from data source 362, memory 382, transmit processor 364, controller / processor 380, TX MIMO processor 366, transceivers 354a-t, antenna 352a-t, and / or other aspects described herein. Similarly, “receiving” may refer to various mechanisms of obtaining data, such as obtaining data from antennas 352a-t, transceivers 354a-t, RX MIMO detector 356, controller / processor 380, receive processor 358, memory 382, and / or other aspects described herein.

[0074] In some aspects, a processor may be configured to perform various operations, such as those associated with the methods described herein, and transmit (output) to or receive (obtain) data from another interface that is configured to transmit or receive, respectively, the data.

[0075] FIGS. 4A, 4B, 4C, and 4D depict aspects of data structures for a wireless communications network, such as wireless communications network 100 of FIG. 1.

[0076] In particular, FIG. 4A is a diagram 400 illustrating an example of a first subframe within a 5G (e.g., 5GNR) frame structure, FIG. 4B is a diagram 430 illustrating an example of DL channels within a 5G subframe, FIG. 4C is a diagram 450 illustrating an example of a second subframe within a 5G frame structure, and FIG. 4D is a diagram 480 illustrating an example of UL channels within a 5G subframe.

[0077] Wireless communications systems may utilize orthogonal frequency division multiplexing (OFDM) with a cyclic prefix (CP) on the uplink and downlink. Such systems may also support half-duplex operation using time division duplexing (TDD). OFDM and single-carrier frequency division multiplexing (SC-FDM) partition the system bandwidth (e.g., as depicted in FIGS. 4B and 4D) into multiple orthogonal subcarriers. Eachsubcarrier may be modulated with data. Modulation symbols may be sent in the frequency domain with OFDM and / or in the time domain with SC-FDM.

[0078] A wireless communications frame structure may be frequency division duplex (FDD), in which, for a particular set of subcarriers, subframes within the set of subcarriers are dedicated for either DL or UL. Wireless communications frame structures may also be time division duplex (TDD), in which, for a particular set of subcarriers, subframes within the set of subcarriers are dedicated for both DL and UL.

[0079] In FIG. 4A and 4C, the wireless communications frame structure is TDD where D is DL, U is UL, and X is flexible for use between DL / UL. UEs may be configured with a slot format through a received slot format indicator (SFI) (dynamically through DL control information (DCI), or semi-statically / statically through radio resource control (RRC) signaling). In the depicted examples, a 10 ms frame is divided into 10 equally sized 1 ms subframes. Each subframe may include one or more time slots. In some examples, each slot may include 7 or 14 symbols, depending on the slot format. Subframes may also include mini-slots, which generally have fewer symbols than an entire slot. Other wireless communications technologies may have a different frame structure and / or different channels.

[0080] In certain aspects, the number of slots within a subframe is based on a slot configuration and a numerology. For example, for slot configuration 0, different numerol ogies (p) 0 to 6 allow for 1, 2, 4, 8, 16, 32, and 64 slots, respectively, per subframe. For slot configuration 1, different numerol ogies 0 to 2 allow for 2, 4, and 8 slots, respectively, per subframe. Accordingly, for slot configuration 0 and numerology p, there are 14 symbols / slot and 2p slots / subframe. The subcarrier spacing and symbol length / duration are a function of the numerology. The subcarrier spacing may be equal to 2^ X 15 kHz, where p is the numerology 0 to 6. As such, the numerology p = 0 has a subcarrier spacing of 15 kHz and the numerology p = 6 has a subcarrier spacing of 960 kHz. The symbol length / duration is inversely related to the subcarrier spacing. FIGS. 4A, 4B, 4C, and 4D provide an example of slot configuration 0 with 14 symbols per slot and numerology p = 2 with 4 slots per subframe. The slot duration is 0.25 ms, the subcarrier spacing is 60 kHz, and the symbol duration is approximately 16.67 ps.

[0081] As depicted in FIGS. 4A, 4B, 4C, and 4D, a resource grid may be used to represent the frame structure. Each time slot includes a resource block (RB) (also referredto as physical RBs (PRBs)) that extends, for example, 12 consecutive subcarriers. The resource grid is divided into multiple resource elements (REs). The number of bits carried by each RE depends on the modulation scheme.

[0082] As illustrated in FIG. 4A, some of the REs carry reference (pilot) signals (RS) for a UE (e.g., UE 104 of FIGS. 1 and 3). The RS may include demodulation RS (DMRS) and / or channel state information reference signals (CSI-RS) for channel estimation at the UE. The RS may also include beam measurement RS (BRS), beam refinement RS (BRRS), and / or phase tracking RS (PT-RS).

[0083] FIG. 4B illustrates an example of various DL channels within a subframe of a frame. The physical downlink control channel (PDCCH) carries DCI within one or more control channel elements (CCEs), each CCE including, for example, nine RE groups (REGs), each REG including, for example, four consecutive REs in an OFDM symbol.

[0084] A primary synchronization signal (PSS) may be within symbol 2 of particular subframes of a frame. The PSS is used by a UE (e.g., 104 of FIGS. 1 and 3) to determine subframe / symbol timing and a physical layer identity.

[0085] A secondary synchronization signal (SSS) may be within symbol 4 of particular subframes of a frame. The SSS is used by a UE to determine a physical layer cell identity group number and radio frame timing.

[0086] Based on the physical layer identity and the physical layer cell identity group number, the UE can determine a physical cell identifier (PCI). Based on the PCI, the UE can determine the locations of the aforementioned DMRS. The physical broadcast channel (PBCH), which carries a master information block (MIB), may be logically grouped with the PSS and SSS to form a synchronization signal (SS) / PBCH block. The MIB provides a number of RBs in the system bandwidth and a system frame number (SFN). The physical downlink shared channel (PDSCH) carries user data, broadcast system information not transmitted through the PBCH such as system information blocks (SIBs), and / or paging messages.

[0087] As illustrated in FIG. 4C, some of the REs carry DMRS (indicated as R for one particular configuration, but other DMRS configurations are possible) for channel estimation at the base station. The UE may transmit DMRS for the PUCCH and DMRS for the PUSCH. The PUSCH DMRS may be transmitted, for example, in the first one or two symbols of the PUSCH. The PUCCH DMRS may be transmitted in differentconfigurations depending on whether short or long PUCCHs are transmitted and depending on the particular PUCCH format used. UE 104 may transmit sounding reference signals (SRS). The SRS may be transmitted, for example, in the last symbol of a subframe. The SRS may have a comb structure, and a UE may transmit SRS on one of the combs. The SRS may be used by a base station for channel quality estimation to enable frequency-dependent scheduling on the UL.

[0088] FIG. 4D illustrates an example of various UL channels within a subframe of a frame. The PUCCH may be located as indicated in one configuration. The PUCCH carries uplink control information (UCI), such as scheduling requests, a channel quality indicator (CQI), a precoding matrix indicator (PMI), a rank indicator (RI), and HARQ ACK / NACK feedback. The PUSCH carries data, and may additionally be used to carry a buffer status report (BSR), a power headroom report (PHR), and / or UCI.Example Transceiver Front End

[0089] FIG. 5 illustrates example components of a transceiver front end 506 of a first wireless communications device 502, which may be used to communicate with a second wireless communications devices 504.

[0090] The first wireless communications device 502 may be an example of a user equipment (UE), such as UE 104 described with respect to FIG. 1 and FIG. 3. In some cases, the second wireless communications device 504 may be an example of a network entity, such as BS 102 described with respect to FIG. 1 and FIG. 3 or a disaggregated base station described with respect to FIG. 2.

[0091] In some cases, the transceiver front end 506 may be, or may include, a chip, system on chip (SoC), chipset, package or device that includes one or more modems 512. In some cases, the one or more modems 512 may include, for example, any of a WWAN modem (e.g., a modem configured to communicate via E-UTRA and / or 5G NR standards), a WLAN modem (e.g., a modem configured to communicate via 802.11 standards), a Bluetooth modem, a NTN modem, etc. In certain aspects, the first wireless communications device 502 also includes one or more radios (collectively “the radio 550”). In some aspects, the first wireless communications device 502 further includes one or more processors, processing blocks or processing elements (collectively “the processor 510”) and one or more memory blocks or elements (collectively “the memory 540”).

[0092] In certain aspects, the processor 510 may include a processor representative of an application processor that generates information (e.g., application data such as content requests) for transmission and / or receives information (e.g., requested content) via the one or more modems 512. In some cases, the processor 510 may include a microprocessor associated with the one or more modems 512, which process any of certain protocol stack layers associated with a radio access technology (RAT). For example, the processor 510 may process any of an application layer, packet layer, WLAN protocol stack layers (e.g., a link or MAC layer), and / or WWAN protocol stack layers (e.g., a radio resource control (RRC) layer, a packet data convergence protocol (PDCP) layer, a radio link control (RLC) layer, and a MAC layer). In some cases, at least one of the modems 512 (e.g., the WWAN modem) may be in communication with one or more of the other modems 512 (e.g., the WLAN modem and / or Bluetooth modem). For example, the processor 510 may be representative of at least one of the modems 512 in communication with one or more of the other modems 512.

[0093] The one or more modems 512 may include an intelligent hardware block or device such as, for example, an application-specific integrated circuit (ASIC) among other possibilities. The one or more modems 512 may generally be configured to implement a physical (PHY) layer. For example, the one or more modems 512 may be configured to modulate packets and to output the modulated packets to the radio 550 for transmission over a wireless medium. The one or more modems 512 is similarly configured to obtain modulated packets received by the radio 550 and to demodulate the packets to provide demodulated packets. In addition to a modulator and a demodulator, the one or more modems 512 may further include digital signal processing (DSP) circuitry, automatic gain control (AGC), a coder, a decoder, a multiplexer and a demultiplexer (not shown).

[0094] As an example, while in a transmission mode, the one or more modems 512 may obtain data from the processor 510. The data obtained from the processor 510 may be provided to a coder, which encodes the data to provide encoded bits. The encoded bits may be mapped to points in a modulation constellation (e.g., using a selected modulation and coding scheme) to provide modulated symbols. The modulated symbols may be mapped, for example, to spatial stream(s) or space-time streams. The modulated symbols may be multiplexed, transformed via an inverse fast Fourier transform (IFFT) block, and subsequently provided to DSP circuitry for transmit windowing and filtering. The digitalsignals may be provided to a digital-to-analog converter (DAC) 522. In certain aspects involving beamforming, the modulated symbols in the respective spatial streams may be precoded via a steering matrix prior to provision to the IFFT block.

[0095] The one or more modems 512 may be coupled to the radio 550 including a transmit (TX) path 514 (also known as a transmit chain) for transmitting signals via one or more antennas 518 and a receive (RX) path 516 (also known as a receive chain) for receiving signals via the antennas 518. When the TX path 514 and the RX path 516 share an antenna 518, the paths may be connected with the antenna via an interface 520, which may include any of various suitable RF devices, such as a switch, a duplexer, a diplexer, a multiplexer, and the like. As an example, the one or more modems 512 may output digital in-phase (I) and / or quadrature (Q) baseband signals representative of the respective symbols to the DAC 522.

[0096] Receiving I or Q baseband analog signals from the DAC 522, the TX path 514 may include a baseband filter (BBF) 524, a mixer 526 (which may include one or several mixers), and a power amplifier (PA) 528. The BBF 524 filters the baseband signals received from the DAC 522, and the mixer 526 mixes the filtered baseband signals with a transmit local oscillator (LO) signal to convert the baseband signal to a different frequency (e.g., upconvert from baseband to a radio frequency). In some aspects, the frequency conversion process produces the sum and difference frequencies between the LO frequency and the frequencies of the baseband signal. The sum and difference frequencies are referred to as the beat frequencies. Some beat frequencies are in the RF range, such that the signals output by the mixer 314 are typically RF signals, which may be amplified by the PA 528 before transmission by the antenna 518. The antennas 518 may emit RF signals, which may be received at the second wireless communications device 504. While one mixer 526 is illustrated, several mixers may be used to upconvert the filtered baseband signals to one or more intermediate frequencies and to thereafter upconvert the intermediate frequency signals to a frequency for transmission.

[0097] The RX path 516 may include a low noise amplifier (LNA) 530, a mixer 532 (which may include one or several mixers), and a baseband filter (BBF) 534. RF signals received via the antenna 518 (e.g., from the second wireless communications device 504) may be amplified by the LNA 530, and the mixer 532 mixes the amplified RF signals with a receive local oscillator (LO) signal to convert the RF signal to a baseband frequency (e.g., downconvert). The baseband signals output by the mixer 532 may befiltered by the BBF 534 before being converted by an analog-to-digital converter (ADC) 536 to digital I or Q signals for digital signal processing. The one or more modems 512 may receive the digital I or Q signals and further process the digital signals, for example, demodulating the digital signals.

[0098] Certain transceivers may employ frequency synthesizers with a voltage- controlled oscillator (VCO) to generate a stable, tunable LO frequency with a particular tuning range. Thus, the transmit LO frequency may be produced by a frequency synthesizer 538, which may be buffered or amplified by an amplifier (not shown) before being mixed with the baseband signals in the mixer 526. Similarly, the receive LO frequency may be produced by the frequency synthesizer 538, which may be buffered or amplified by an amplifier (not shown) before being mixed with the RF signals in the mixer 532. Separate frequency synthesizers may be used for the TX path 514 and the RX path 516.

[0099] While in a reception mode, the one or more modems 512 may obtain digitally converted signals via the ADC 536 and RX path 516. As an example, in the one or more modems 512, digital signals may be provided to the DSP circuitry, which is configured to acquire a received signal, for example, by detecting the presence of the signal and estimating the initial timing and frequency offsets. The DSP circuitry is further configured to digitally condition the digital signals, for example, using channel (narrowband) filtering, analog impairment conditioning (such as correcting for I / Q imbalance), and applying digital gain to ultimately obtain a narrowband signal. The output of the DSP circuitry may be fed to the AGC, which is configured to use information extracted from the digital signals, for example, in one or more received training fields, to determine an appropriate gain. The output of the DSP circuitry also may be coupled with the demodulator, which is configured to extract modulated symbols from the signal and, for example, compute the logarithm likelihood ratios (LLRs) for each bit position of each subcarrier in each spatial stream. The demodulator may be coupled with the decoder, which may be configured to process the LLRs to provide decoded bits. The decoded bits from all of the spatial streams may be fed to the demultiplexer for demultiplexing. The demultiplexed bits may be descrambled and provided to a medium access control layer (e.g., the processor 510) for processing, evaluation, or interpretation.

[0100] The processor 510 and / or one or more modems 512 may control the transmission of signals via the TX path 514 and / or reception of signals via the RX path516. In some aspects, the processor 510 and / or one or more modems 512 may be configured to perform various operations, such as those associated with any of the methods described herein. The processor 510 and / or the one or more modems 512 may include a microcontroller, a microprocessor, an application processor, a baseband processor, a MAC processor, a neural network processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device (PLD), discrete gate or transistor logic, discrete hardware components, or any combination thereof. In some cases, aspects of the processor 510 may be integrated with (incorporated in and / or shared with) the one or more modems 512, such as a microcontroller, a microprocessor, a baseband processor, a medium access control (MAC) processor, a digital signal processor, etc. For example, the processor 510 may be representative of a co-processor (e.g., a microprocessor) associated with the one or more modems 512, and the one or more modems 512 may be representative of an ASIC including the baseband processor, MAC processor, DSP, and / or neural network processor. The memory 540 may store data and program codes (e.g., computer-readable instructions) for performing wireless communications as described herein. The memory 540 may be external to the processor 510 and / or the one or more modems 512 (as illustrated) and / or incorporated therein.

[0101] FIG. 5 shows an example transceiver design. It will be appreciated that other transceiver designs or architectures may be applied in connection with aspects of the present disclosure. For example, while examples discussed herein utilize I and Q signals (e.g., quadrature modulation), those of skill in the art will understand that components of the transceiver may be configured to utilize any other suitable modulation, such as polar modulation. As another example, circuit blocks may be arranged differently from the configuration shown in FIG. 5, and / or other circuit blocks not shown in FIG. 5 may be implemented in addition to or instead of the blocks depicted.Aspects Related to Analog Front End Non-Linear Model Estimation

[0102] When communicating in a wireless communications network, the first wireless communications device 502 may receive an analog wireless signal via one or more antennas, such as the one or more antennas 518. Thereafter, the first wireless communications device 502 may pass the analog wireless signal to an analog front end (AFE) of the first wireless communications device 502. The AFE may comprise various analog devices, such as the LNA 530, the mixer 532, the BBF 534, and the ADC 536.After receiving the wireless signal from the one or more antennas, the AFE may be configured to amplify the analog wireless signal and filter out any unwanted noise and interference. The AFE may also be configured to downconvert the analog wireless signal to a lower intermediate frequency (IF) that may be easily processed by the ADC 536. The ADC 536 may be configured to convert the analog wireless signal to a digital signal, which may then be passed to a digital front end (DFE) in the one or more modems 512 of the first wireless communication device 502 for further processing.

[0103] For example, after being output by the ADC 536, the DFE may further filter, amplify, and mix the digital signal with local oscillator signals to convert it to a baseband frequency. The digital signal may then passed to digital processing components of the first wireless communications device 502, such as a digital signal processor (DSP), where it is further processed for decoding, demodulation, and other functions.

[0104] In some cases, signal-to-noise (SNR) (e.g., a relative strength of a desired signal compared to background noise present in a wireless communications network) may be limited by two types of noises, such as internal noise and external noise. This internal noise may be the result of thermal noise (e.g., kTBFG noise due to one or more components of the first wireless communications device 502 heating up), integrated phase noise (IPN), and analog and digital component impairments of the first wireless communications device 502, such as non-linear distortion.

[0105] The external noise may comprise external interference caused by one or more blocker signals that are received by the first wireless communications device 502 concurrently with the analog wireless signal. In some cases, this external interference caused by the one or more blocker signals may lead to several negative effects at the first wireless communications device 502 when receiving the analog wireless signal. For example, the one or more blocker signals may collide with the analog wireless signal (e.g., in a cell edge scenario) and may directly impact the SNR associated with the analog wireless signal received by the first wireless communications device 502. In other cases, the one or more blocker signals may be orthogonal in frequency to the analog wireless signal received by the first wireless communications device. However, in this case, energy of the one or more blocker signals may force the AFE of the first wireless communications device 502 into saturation, which may limit SNR associated with the analog wireless signal received by the first wireless communications device 502 by introducing third- order intermodulation distortion (IM3) in the AFE.

[0106] IM3 is a type of nonlinear distortion that can occur in electronic systems and components, such as amplifiers or mixers, when two or more high-power signals are received, such as the analog wireless signal and the one or more blocker signals. In some cases, this may occur, for example, when a specific base station (e.g., gNB) transmits, using a same beam to two different UEs and one of the UEs has lower link budget than the other. When high-power signals are combined in a nonlinear system, these signals may create additional signals at frequencies that are the sum or difference of the original frequencies. These additional signals are called intermodulation products, and the distortion they create is called intermodulation distortion. IM3 is a specific type of intermodulation distortion that occurs at the third-order frequency difference between the two original signals. IM3 can cause unwanted signals to be generated at frequencies that interfere with the desired signals, leading to degradation of the system performance.

[0107] In some cases, IM3 of the AFE may play a noticeable role in maximizing the total SNR. This may be achieved by optimizing the tradeoff between kTBFG noise (e.g., internal noise) and the IM3 (e.g., external noise) of the AFE. In some cases, this tradeoff may be controlled by an outer loop of an automatic gain controller (AGC) of the first wireless communications device 502. For example, to maximize SNR, the AGC may be configured to select a gain state (GS) of the AFE that optimizes the tradeoff between kTBFG noise and the IM3, based on synchronization signal block (SSB) or tracking reference signal (TRS) power measurements, which may or may not include external interference.

[0108] As noted above, IM3 noise / distortion in the AFE of the first wireless communications device 502 may occur when the one or more blocker signals are received at the same time as the analog wireless signal intended for the first wireless communications device. FIGS. 6A and 6B illustrate two different scenarios in which IM3 noise / distortion may occur based on the transmission of the one or more blocker signals.

[0109] For example, a first scenario illustrated in FIG. 6A involves a network entity 602 (e.g., BS 102) transmitting wireless signals to a first UE 604 and a second UE 606 having different link budgets. For example, the first UE 604 may have a high / strong link budget (LB) while the second UE 606 may have low / weak link budget. Due to the different link budgets, the network entity 602 may transmit the wireless signals to the first UE 604 and the second UE 606 on a same transmit beam using different transmit powers. For example, when transmitting the wireless signals to the first UE 604, the network entity602 may not need to use a full transmit power since the link budget for the first UE 604 is high and, as such, power-per-tone may be reduced to conserve power. Conversely, when transmitting the wireless signals to the second UE 606, the network entity 602 may need to use a full transmit power since the link budget for the second UE 606 is low. As a result of the high transmit power used to transmit the wireless signals to the second UE 606, the wireless signals transmitted to the second UE 606 may act as blocker signals to the wireless signals received by the first UE 604, causing non-linear distortion (e.g., IM3 noise / distortion) at an AFE of the first UE 604.

[0110] A first scenario illustrated in FIG. 6B involves subband full duplex (SBFD) communication between the network entity 602 and the first UE 604 and the second UE 606. For example, as shown, in some cases, the network entity 602 may be capable of transmitting downlink signals to the first UE 604 and, at the same time, receiving uplink signals from the second UE 606. In some cases, because the second UE 606 is located further away from the network entity 602 as compared to the first UE 604, the uplink signals may be transmitted by the second UE 606 at a high transmit power. As a result of the high transmit power used to transmit the uplink signals to network entity 602, the uplink signals transmitted to the network entity 602 may act as blocker signals to the downlink signals received by the first UE 604, causing non-linear distortion (e.g., IM3 noise / distortion) at an AFE of the first UE 604.

[0111] Generally, blocker signals may be filtered out by one or more components of the AFE of a wireless communications device, such as the UE 700 illustrated in FIG. 7. For example, FIG. 7 illustrates a receive chain 702 of the UE 700, including an AFE 704, digital front end (DFE) 712, and modem 716. The UE 700 may be an example of the UE 104, the first UE 604, or any other UE described herein. In some cases, the receive chain 702 may be an example of the RX path 516 illustrated in FIG. 5.

[0112] In some cases, blocker signals received by the UE 700 may be filtered out by filter(s) 706, which may include one or more of a spatial combining component an inter frequency band pass filter (IF BPF), or a base band low pass filter (BB LPF). However, this filtering may not remove non-linear IM3 distortion that these blocker signals produce in the AFE 704, since the intermodulation between the wireless signals intended for the UE 700 and the blocker signals may fall (partially or entirely) on a bandwidth of the wireless signals intended for the first UE 604 due to the following, or any other, combination: f_intermod=2-f_l-f_2, f_intermod=2-f_2-f_l, where f intermodis a frequency of the intermodulation, _1 is a frequency of a wireless signal intended for the wireless communications device, and _2 is a frequency of the blocker signals.

[0113] In some cases, a point at which the non-linearity and IM3 distortion of the AFE 702 begins to occur may be known as an output third order intercept point (OIP3). For example, OIP3 is a measure of the maximum power level at which a device, such as the AFE, may operate before the onset of IM3 distortion. OIP3 may be defined as the output power level at which the third-order intermodulation products generated by the AFE are equal in amplitude to fundamental signals received by the AFE. In other words, it is the power level at which the AFE's output intercepts a line that is 3 times the frequency difference between two input signals (e.g., the one or more blocker signal and the analog wireless signal).

[0114] OIP3 is a key parameter in the design of high-performance RF systems and components, as it provides an indication of the linearity and distortion performance of a device, such as the AFE 702. A high OIP3 indicates that a device can handle high-power signals without generating significant levels of intermodulation distortion, while a low OIP3 indicates that the device may be prone to generating significant levels of IM3 distortion at high input power levels.

[0115] As can be seen, the non-linear characteristics of the AFE 702 may depend on OIP3. One manner of reducing these non-linear characteristics may be to increase OIP3 and therefore increase the linear dynamic range of the AFE 702, but this may result in a significant increase in power consumption. Another manner of reducing or eliminating these non-linear characteristics may involve using a linearizer configured to determine a non-linearity model or function of the AFE and remove its effects on received signals, for example, by applying a correction model determined based on the non-linearity model.

[0116] For example, as shown in FIG. 7, the UE 700 includes an antenna 708 that may be used to receive one or more analog signals. After being received, the one or more analog signals may be provided to the AFE 704 for filtering by the filter(s) 706. In some cases, the filter(s) 706 may be configured to filter out certain frequencies from the analog signal that fall outside of a filter bandwidth of the filter(s) 706. Thereafter, the filtered analog signal may be provided to an analog-to-digital converter (ADC) 710 configured to convert the filtered analog signal to a digital signal according to a particular ADC sampling rate (e.g., a rate at which the ADC 710 samples the filtered analog signal andconverts it into a digital representation). The digital signal may then be provided to a digital front end (DFE) 712 of the first UE 604 for further processing before being provided to the modem 716.

[0117] In some cases, the analog signal received by the UE 700 may include one or more signals intended for the UE 700 as well as one or more blocker signals not intended for the UE 700. These blocker signals, when received with the one or more signals intended for the UE 700, may create additional signals at frequencies that are the sum or difference of the frequencies at which the one or more signals intended for the UE 700 and the one or more blocker signals are received at. As noted above, these additional signals are called intermodulation products and may cause intermodulation distortion and non-linearities in the AFE 704, negatively effecting an ability of the UE 700 to properly receive, process, and recover the one or more signals intended for the UE 700 in the received analog signal.

[0118] One way to help reduce or eliminate the intermodulation distortion and nonlinearities may be to use a linearizer, such as the linearizer 714 in the DFE 712. For example, in some cases, the linearizer 714 may be configured to determine or estimate a non-linearity model or function of the AFE 704 (e.g., caused by the one or more blocker signals) and remove or mitigate the non-linear effects on received analog signal based on the non-linear model, for example, by applying a correction model (e.g., an inverse of the non-linear model or some other function). As such, proper determination / estimation of the non-linear model is crucial to ensure that the linearizer 714 is able to remove or at least reduce the non-linear effects of the AFE 704 on signals received by the UE 700.

[0119] Without proper determination / estimation of the non-linear model or function of the AFE 704, the linearizer may not be able to remove or reduce the non-linear effects of the AFE 704, such as IM3 distortion, which may lead to a decrease in system performance (e.g., decreasing SNR). For example, in some cases, without proper determination / estimation of the non-linear effects of the AFE 704, IM3 distortion may not be able to be removed, which may result in the UE 700 not being able to properly receive and decode signals intended for the UE 700. Not being able to properly receive and decode signals intended for the UE 700 may, in turn, lead to unnecessary consumption of additional time-frequency resources in a network and power resources at the UE 700 associated with receiving retransmissions of the signals intended for the UE 700.

[0120] Accordingly, aspects of the present disclosure provide techniques for determining or estimating a non-linear model of an AFE of a first wireless communications device, such as a UE, to allow the first wireless communications device to properly remove or mitigate the non-linearities described above. For example, in some cases, these techniques may involve far-field training in which a second wireless communications device is used to transmit a known or pre-configured signal to the first wireless communications device that enables the first wireless communications device to determine or estimate a non-linear model of the AFE. The first wireless communications device may then apply a correction model, based on the determined non-linear model, to linearize a non-linear response of the AFE, which may improve system performance (e.g., increase SNR) by increasing an effective dynamic range of the AFE and allow the first wireless communications device to remove distortions in received signals, such as IM3 distortion resulting from intermodulation between signals intended for the UE and interfering signals. By increasing the effective dynamic range of the AFE and removing distortions in the received signals, the first wireless communications device may avoid the unnecessary consumption of additional time-frequency resources and power resources described above.

[0121] While these the techniques described above may be especially helpful in scenarios involving interfering blocker signals to reduce or mitigate intermodulation distortion, these techniques may also be in scenarios not involving interfering blocker signals. For example, even in the scenarios not involving interfering blocker signals, a non-linear range of the AFE may be increased, which may reduce non-linearities in an analog-to-digital conversion process of signals received by the UE. Reducing the nonlinearities in the analog-to-digital conversion process may reduce errors in the resulting digital signals and may require less additional digital processing to compensate for these errors, thereby reducing power consumption at the UE.Example Operations of Entities in a Communications Network

[0122] FIG. 8 depicts a process flow including operations 800 for communications in a network between a first wireless communications device 802 and a second wireless communications device 804. In some cases, the operations 800 may be performed by the first wireless communications device 802 and a second wireless communications device 804 for far-field training to allow the first wireless communications device 802 todetermine a non-linear model of an AFE (e.g., AFE 704) of the first wireless communications device 802 and linearize a non-linear response of the AFE.

[0123] In some aspects, the first wireless communications device 802 may be an example of UE 104 depicted and described with respect to FIG. 1 and 3. In some cases, the second wireless communications device 804 may be an example of the BS 102 depicted and described with respect to FIG. 1 and 3 or a disaggregated base station depicted and described with respect to FIG. 2. In some cases, the second wireless communications device 804 may be another example of UE 104 depicted and described with respect to FIG. 1 and 3. For example, when the second wireless communications device 804 is another example of the UE 104, the first wireless communications device and the second wireless communications device may communicate directly with each other using a sidelink communication channel.

[0124] As shown, operations 800 begin at 810 with the first wireless communications device 802 transmitting a first message including a request for the second wireless communications device 804 to transmit a signal to the first wireless communications device 802. As will be described below, the first wireless communications device 802 may use the signal to determine a non-linear (NL) model of the AFE of the first wireless communications device, determine a correction model based on the NL model, and linearize a non-linear response of the AFE based on the correction mode.

[0125] To help in determining the non-linear model of the AFE, the signal may comprise a signal that has a peak to average power ratio (PAPR) equal to or exceeding a threshold PAPR, allowing the signal to cover a large dynamic range of the AFE of the first wireless communications device 802. Similarly, in some cases, the signal may comprise a signal that has a predefined amplitude distribution. In some cases, the signal may comprise a known signal having a pre-configured payload, such as a reference signal, a synchronization signal block (SSB), or a sounding reference signal (SRS). In some cases, the signal may be received on one of a control message or a data message from the second wireless communications device 804. In some cases the signal may be transmitted on time-frequency resources dedicated for far-field training.

[0126] In some cases, the first message may further include one or more parameters for the second wireless communications device 804 to use to transmit the signal to the first wireless communications device 802. For example, in some cases, the one or moreparameters include an indication of a required NL transmission (TX) floor for the second wireless communications device 804 to use to transmit the signal to the first wireless communications device 802. The first wireless communications device 802 may specify the NL TX floor to use to transmit the signal because both the NL TX floor associated with the second wireless communications device 804 and NL reception (RX) floor associated with the first wireless communications device may have an effect on an ability of the first wireless communications device 802 to properly determine the NL model and linearize the NL response of the AFE of the first wireless communications device 802. In some cases, the NL TX floor may be indicated as an error vector magnitude (EVM) in decibels relative to a carrier frequency (dBc), which is a power ratio of the signal to a carrier signal.

[0127] In some cases, the one or more parameters include a transmission configuration indicator (TCI) state for the second wireless communications device 804 to use to transmit the signal to the first wireless communications device 802. For example, TCI state may be associated with a transmit beam of the second wireless communications device 804 and a corresponding receive beam of the first wireless communications device 802. Accordingly, by indicating the TCI state, the second wireless communications device 804 may know which transmit beam to use to transmit the signal such that the signal is received using the corresponding receive beam of the first wireless communications device 802.

[0128] In some cases, the one or more parameters include a bandwidth for the second wireless communications device 804 to use to transmit the signal to the first wireless communications device 802. In some cases, the one or more parameters include a carrier frequency for the second wireless communications device 804 to use to transmit the signal to the first wireless communications device 802. In some cases, the one or more parameters include a transmission power for the second wireless communications device 804 to use to transmit the signal to the first wireless communications device 802.

[0129] As shown in step 812, the first wireless communications device 802 receives the signal from the second wireless communications device 804 based on the first message. For example, the first wireless communications device 802 may receive the signal from the second wireless communications device in accordance with the one or more parameters. For example, the first wireless communications device 802 may receive the signal according to the indicated TCI state, bandwidth, carrier frequency, transmissionpower, NL TX floor, etc. Similarly, the second wireless communications device 804 may transmit the signal in accordance with the one or more parameters.

[0130] In some cases, as shown at 814, the first wireless communications device 802 may receive, from the second wireless communications device 804, an indication of an NL TX floor or an EVM associated with the signal received from the second wireless communications device 804. For example, in some cases, the NL TX floor or EVM received from the second wireless communications device may comprise an actual NL TX floor used to transmit the signal or an actual EVM used to transmit the signal.

[0131] In some cases, the first wireless communications device 802 may receive the actual NL TX floor or actual EVM based on a request transmitted by the first wireless communications device 802. For example, in some cases, the first message transmitted in step 810 may further include a request for the actual NL TX floor or actual EVM used to transmit the signal. The first wireless communications device 802 may then receive the actual NL TX floor or actual EVM used to transmit the signal from the second wireless communications device 804 based on the request for the actual NL TX floor or actual EVM used to transmit the signal. In some cases, the first wireless communications device 802 may receive, from the second wireless communications device 804, the actual NL TX floor or actual EVM used to transmit the signal together with the signal in a same message or may receive the signal and actual NL TX floor or actual EVM in separate messages.

[0132] Thereafter, in step 816, the first wireless communications device 802 determines an NL model of the AFE of the first wireless communications device 802 based on the signal received from the second wireless communications device 804. For example, because the signal received from the second wireless communications device 804 comprises a preconfigured or known signal, the first wireless communications device 802 may be able to determine a difference between the preconfigured or known signal and the signal received from the second wireless communications device 804 and processed by the AFE. The first wireless communications device 802 may then determine the NL model of the AFE based on this difference. For example, the first wireless communications device 802 may expect a preconfigured or known signal x to be received. After the signal x is received and processed by the AFE of the first wireless communications device 802, the resulting digital signal y may be represented as = G(x), where G is the NL model of the AFE. Because the first wireless communications device802 knows both the preconfigured or known signal x and the resulting digital signal y, the first wireless communications device 802 may be able to determine the NL model G of the AFE. In some cases, the first wireless communications device 802 may also have to account for other noises (e.g., AWGN noise) and remove them from the resulting digital signal y when determining the NL model G of the AFE.

[0133] Thereafter, as shown in step 818, the first wireless communications device 802 takes one or more actions based on the determined non-linear model of the AFE. For example, in some cases, taking the one or more actions may comprise determining a correction model based on the determined non-linear model, as shown in step 820. For example, the first wireless communications device 802 may be able to determine a correction model K, which may be an inverse of the NL model G, such that K(y) = K(G(x)) = x. Thereafter, as shown in step 822, the first wireless communications device 802 may linearize a non-linear response of the AFE based on the determined correction model, for example, by applying the correction model K to the resulting digital signal y.

[0134] In some cases, the first wireless communications device 802 may select the second wireless communications device 804 from one or more neighboring wireless communications devices in the network. In some cases, the first wireless communications device 802 may select one of the one or more neighboring wireless communications devices based on cross link interference (CLI) reports and / or NL TX capabilities associated with the one or more neighboring wireless communications devices.

[0135] For example, in some cases, the first wireless communications device 802 may optionally receive one or more CLI reports from one or more neighboring wireless communications devices, including the second wireless communications device 804 as shown at 824. Additionally, as shown in step 826, the first wireless communications device 802 may also receive and store an indication of a respective NL TX floor for each of the neighboring wireless communications devices, including the second wireless communications device 804. In some cases, the respective NL TX floors may comprise an NL TX floors that the neighboring wireless communications devices are capable of transmitting with.

[0136] Thereafter, shown in step 828, the first wireless communications device 802 may optionally determine a set of neighboring wireless communications devices, from the one or more neighboring wireless communications devices, which have a sufficientlink budget for transmitting the signal to the first wireless communications device. In some cases, the first wireless communications device 802 may optionally determine a set of neighboring wireless communications devices based on the one or more CLI reports. In some cases, the first wireless communications device 802 may determine the set of wireless communications device further based on the respective NL TX floor of the neighboring wireless communications devices. Thereafter, in step 830, the first wireless communications device 802 may select the second wireless communications device 804 from the set of neighboring wireless communications devices.

[0137] In some cases, the first wireless communications device 802 may store parameters associated with the received one or more CLI reports, such as signal strengths associated with each of the received one or more CLI reports, NL TX floor of the neighboring wireless communications devices from which the one or more CLI reports are received, and / or other parameters associated with the one or more CLI reports. In such cases, the first wireless communications device 802 may select the second wireless communications device 804 in step 828 based on the stored parameters associated with a CLI report, of the one or more CLI reports, received from the second wireless communications device 804. For example, in some cases, the first wireless communications device 802 may select the second wireless communications device 804 based on a signal strength associated with the second wireless communications device 804 being above a threshold signal strength (e.g., a threshold signal strength that provides a sufficient amount of SNR to perform the far-field training). In some cases, the first wireless communications device 802 may select the second wireless communications device 804 in step 828 further based on a respective NL TX floor or TX EVM associated with the second wireless communications device 804. For example, the first wireless communications device 802 may select the second wireless communications device 804 based on the second wireless communications device 804 having an NL TX floor or TX EVM better (e.g., smaller in percentage - for example, 1% is better than 5%) than a threshold.

[0138] In some cases, when the first wireless communications device 802 and the second wireless communications device 804 are UEs (e.g., examples of UE 104), the first wireless communications device 802 and the second wireless communications device 804 may perform the far-field training in operations 800 using a sidelink channel without involvement of a network entity, such as BS 102, using sidelink mode 2 communication.For example, in some cases, transmitting the first message including the request in step 810 may include transmitting the first message including the request to the second wireless communications device using a sidelink channel. Additionally, in some cases, receiving the signal from the second wireless communications device 804 in step 812 may include receiving the signal from the second wireless communications device using the sidelink channel.

[0139] FIG. 9 depicts a process flow including operations 900 for communications in a network between a first wireless communications device 902, a second wireless communications device 904, and a network entity 906. Similar to FIG. 8, the operations 900 may be performed for far-field training to allow the first wireless communications device 902 to determine a non-linear model of an AFE (e.g., AFE 704) of the first wireless communications device 902 and linearize a non-linear response of the AFE. However, in the example shown in FIG. 9 the far-field training may be performed between the first wireless communications device 902 and the second wireless communications device 904 with the assistance of the network entity 906.

[0140] In some aspects, the first wireless communications device 902 may be an example of UE 104 depicted and described with respect to FIG. 1 and 3. In some cases, the second wireless communications device 904 may be another example of UE 104 depicted and described with respect to FIG. 1 and 3. In some cases, network entity 906 may be an example of the BS 102 depicted and described with respect to FIG. 1 and 3 or a disaggregated base station depicted and described with respect to FIG. 2.

[0141] Operations 900 begin in step 910 with the first wireless communications device 902 receiving one or more cross link interference (CLI) reports from one or more neighboring wireless communications devices, including one or more CLI reports from the second wireless communications device 904. In some cases, as shown in step 912, the first wireless communications device 902 may also optionally receive and store an indication of a respective NL TX floor for each of the neighboring wireless communications devices, including the second wireless communications device 904. In some cases, the respective NL TX floors may comprise an NL TX floors that the neighboring wireless communications devices are capable of transmitting with.

[0142] Thereafter, in step 914, the first wireless communications device 902 may optionally determine a set of neighboring wireless communications devices, from the oneor more neighboring wireless communications devices, which have a sufficient link budget for transmitting the signal to the first wireless communications device. In some cases, the first wireless communications device 902 may optionally determine a set of neighboring wireless communications devices based on the one or more CLI reports. In some cases, the first wireless communications device 902 may determine the set of wireless communications device further based on the respective NL TX floor of the neighboring wireless communications devices. Thereafter, in step 916, the first wireless communications device 902 may optionally select the second wireless communications device 904 from the set of neighboring wireless communications devices.

[0143] In some cases, the first wireless communications device 902 may store parameters associated with the received one or more CLI reports (e.g., signal strength associated with received CLI reports, NL TX floor or TX EVM of neighboring wireless communications devices, etc.). In such cases, the first wireless communications device 902 may select the second wireless communications device 904 in step 916 based on the stored parameters associated with a CLI report, of the one or more CLI reports, received from the second wireless communications device, as described above. In some cases, the first wireless communications device 902 may select the second wireless communications device 904 in step 916 further based on a respective NL TX floor associated with the second wireless communications device 904, as described above.

[0144] As shown in step 918, the first wireless communications device 902 may transmit a first message to the network entity 906 including a request for the second wireless communications device 904 to transmit a signal to the first wireless communications device 902. In some cases, the signal may comprise a signal that has a peak to average power ratio (PAPR) equal to or exceeding a threshold PAPR, allowing the signal to cover a large dynamic range of the AFE of the first wireless communications device 902. Similarly, in some cases, the signal may comprise a signal that has a predefined amplitude distribution.

[0145] In some cases, the request for the second wireless communications device 904 to transmit the signal may be based on a CLI report from the second wireless communications device 904 received, for example, in step 910. For example, the CLI report received from the second wireless communications device 904 may indicate that the second wireless communications device 904 has a sufficient link budget for far-field training and is able to transmit the signal to first wireless communications device. In suchcases, the first wireless communications device 902 may select the second wireless communications device 904 based on the CLI report and may transmit the first message indicating the selected second wireless communications device 904 to the network entity 906 and requesting that the second wireless communications device 904 transmit the signal to the first wireless communications device 902.

[0146] In some cases, the first message may request that the network entity 906 allocate time-frequency resources for the second wireless communications device 904 to use to transmit a sounding reference signal (SRS). In this case, the signal requested to be transmitted in step 918 may comprise the SRS from the second wireless communications device 904. In some cases, the first message further includes one or more parameters for the second wireless communications device 904 to use to transmit the SRS to the first wireless communications device 902. For example, as discussed above, the one or more parameters include at least one of an NL TX floor for the second wireless communications device 904 to use to transmit the SRS to the first wireless communications device 902, a TCI state for the second wireless communications device 904 to use to transmit the SRS to the first wireless communications device 902, a bandwidth for the second wireless communications device 904 to use to transmit the SRS to the first wireless communications device 902, a carrier frequency for the second wireless communications device 904 to use to transmit the SRS to the first wireless communications device 902, or a transmission power for the second wireless communications device 904 to use to transmit the SRS to the first wireless communications device 902.

[0147] In some cases, in addition to or instead of specifically indicating the second wireless communications device 904 to the network entity 906, the first wireless communications device 902 may optionally transmit the one or more CLI reports to the network entity 906 in step 920, including at least one CLI report associated with the second wireless communications device 904. In such cases, the network entity 906 may optionally select, in step 922, the second wireless communications device 904, from the one or more neighboring wireless communications devices of the first wireless communications device 902, based on the at least one CLI report associated with the second wireless communications device 904. In some cases, the network entity 906 may also determine the one or more parameters (e.g., described above) for the second wireless communications device 904 to use to transmit the SRS.

[0148] In some cases, based on the request from the first wireless communications device and the selecting the second wireless communications device 904, the network entity 906 may allocate the time-frequency resources for the second wireless communications device 904 to use to transmit the SRS to the first wireless communications device 902. The first wireless communications device 902 may then receive, from the network entity 906, an indication of the time-frequency resources for the second wireless communications device 904 to use to transmit the SRS and an indication of the NL TX floor for the SRS.

[0149] As shown in step 926, the network entity 906 may forward the request in the first message to the second wireless communications device 904 in a second message. For example, the second message may include the request to transmit the SRS to the first wireless communications device 902. In some cases, the second message may also include the one or more parameters for transmitting the SRS discussed above (e.g., TL TX floor, TCI state, carrier frequency, bandwidth, etc.). Additionally, in some cases, the one or more parameters included in the second message may further include the allocated time-frequency resources for the second wireless communications device 904 to use to transmit the SRS to the first wireless communications device 902.

[0150] Thereafter, as shown in step 928, the second wireless communications device 904 may transmit the SRS to the first wireless communications device 902 in accordance with the one or more parameters and using the indicated time-frequency resources. Similarly, the first wireless communications device 902 may receive the SRS in accordance with the one or more parameters and using the indicated time-frequency resources.

[0151] In some cases, as shown in step 930, the second wireless communications device 904 may transmit feedback information to the network entity 906 indicating an actual NL TX floor or actual EVM used to transmit the SRS. Further in some cases, as shown in step 932, the network entity 906 may forward the feedback information to the first wireless communications device 902 indicating the actual NL TX floor or actual EVM used to transmit the SRS.

[0152] Thereafter, as shown in step 934, the first wireless communications device 902 may determining a non-linear model of the AFE of the first wireless communications device 902 device based on the SRS received from the second wireless communicationsdevice 904. As shown in step 936, the first wireless communications device 902 may then one or more actions based on the determined non-linear model of the AFE. For example, taking the one or more actions may include determining a correction model based on the determined non-linear model linearizing a non-linear response of the AFE based on the determined correction model.Example Operations of a First Wireless Communications Device

[0153] FIG. 10 shows an example of a method 1000 of wireless communication by a first wireless communications device, such as a UE 104 of FIGS. 1 and 3.

[0154] Method 1000 begins at step 1005 with transmitting a first message including a request for a second wireless communications device to transmit a signal to the first wireless communications device. In some cases, the operations of this step refer to, or may be performed by, circuitry for transmitting and / or code for transmitting as described with reference to FIG. 13.

[0155] Method 1000 then proceeds to step 1010 with receiving, from the second wireless communications device, the signal based on the first message. In some cases, the operations of this step refer to, or may be performed by, circuitry for receiving and / or code for receiving as described with reference to FIG. 13.

[0156] Method 1000 then proceeds to step 1015 with determining a non-linear model of an analog front end (AFE) of the first wireless communications device based on the signal received from the second wireless communications device. In some cases, the operations of this step refer to, or may be performed by, circuitry for determining and / or code for determining as described with reference to FIG. 13.

[0157] Method 1000 then proceeds to step 1020 with taking one or more actions based on the determined non-linear model of the AFE. In some cases, the operations of this step refer to, or may be performed by, circuitry for taking and / or code for taking as described with reference to FIG. 13.

[0158] In some aspects, the signal comprises at least one of a signal that has a peak to average power ratio (PAPR) equal to or exceeding a threshold PAPR or a signal that has a predefined amplitude distribution.

[0159] In some aspects, the signal comprises a pre-configured payload; and the signal is received in one of a control message or a data message.

[0160] In some aspects, the signal comprises one of a reference signal, a synchronization signal block (SSB), or a sounding reference signal (SRS).

[0161] In some aspects, the first message further includes one or more parameters for the second wireless communications device to use to transmit the signal to the first wireless communications device; and the signal is received in accordance with the one or more parameters.

[0162] In some aspects, the one or more parameters include a non-linear (NL) transmission (TX) floor for the second wireless communications device to use to transmit the signal to the first wireless communications device.

[0163] In some aspects, the NL TX floor is indicated as an error vector magnitude (EVM).

[0164] In some aspects, the one or more parameters include a transmission configuration indicator (TCI) state for the second wireless communications device to use to transmit the signal to the first wireless communications device; and the TCI state is associated with a transmit beam of the second wireless communications device and a corresponding receive beam of the first wireless communications device.

[0165] In some aspects, the one or more parameters include at least one of: a bandwidth for the second wireless communications device to use to transmit the signal to the first wireless communications device; a carrier frequency for the second wireless communications device to use to transmit the signal to the first wireless communications device; or a transmission power for the second wireless communications device to use to transmit the signal to the first wireless communications device.

[0166] In some aspects, the method 1000 further includes receiving, from the second wireless communications device, an indication of a non-linear (NL) transmission (TX) floor or an error vector magnitude (EVM) associated with the signal received from the second wireless communications device. In some cases, the operations of this step refer to, or may be performed by, circuitry for receiving and / or code for receiving as described with reference to FIG. 13.

[0167] In some aspects, the NL TX floor comprises an actual NL TX floor used to transmit the signal.

[0168] In some aspects, the first message further includes a request for the actual NL TX floor used to transmit the signal; and receiving the actual NL TX floor used to transmit the signal is based on the request for the actual NL TX floor used to transmit the signal.

[0169] In some aspects, taking the one or more actions comprises: determining a correction model based on the determined non-linear model; and linearizing a non-linear response of the AFE based on the determined correction model.

[0170] In some aspects, the method 1000 further includes receiving one or more cross link interference (CLI) reports from one or more neighboring wireless communications devices, including the second wireless communications device. In some cases, the operations of this step refer to, or may be performed by, circuitry for receiving and / or code for receiving as described with reference to FIG. 13.

[0171] In some aspects, the method 1000 further includes transmitting the one or more CLI reports to a network entity, wherein: the one or more CLI reports include at least one CLI report associated with the second wireless communications device. In some cases, the operations of this step refer to, or may be performed by, circuitry for transmitting and / or code for transmitting as described with reference to FIG. 13.

[0172] In some aspects, the method 1000 further includes receiving the signal from the second wireless communications device is based on the one or more CLI reports transmitted to the network entity, including the at least one CLI report associated with the second wireless communications device. In some cases, the operations of this step refer to, or may be performed by, circuitry for receiving and / or code for receiving as described with reference to FIG. 13.

[0173] In some aspects, the signal comprises a sounding reference signal (SRS); and the method further comprises receiving, from the network entity, an indication of timefrequency resources for the second wireless communications device to use to transmit the SRS and an indication of a non-linear (NL) transmission (TX) floor for the SRS.

[0174] In some aspects, the method 1000 further includes determining, based on the one or more CLI reports, a set of neighboring wireless communications devices, from the one or more neighboring wireless communications devices, which have a sufficient link budget for transmitting the signal to the first wireless communications device. In somecases, the operations of this step refer to, or may be performed by, circuitry for determining and / or code for determining as described with reference to FIG. 13.

[0175] In some aspects, the method 1000 further includes selecting the second wireless communications device from the set of neighboring wireless communications devices. In some cases, the operations of this step refer to, or may be performed by, circuitry for selecting and / or code for selecting as described with reference to FIG. 13.

[0176] In some aspects, the method 1000 further includes storing parameters associated with the received one or more CLI reports, wherein selecting the second wireless communications device is based on the stored parameters associated with a CLI report, of the one or more CLI reports, received from the second wireless communications device. In some cases, the operations of this step refer to, or may be performed by, circuitry for storing and / or code for storing as described with reference to FIG. 13.

[0177] In some aspects, the method 1000 further includes receiving and storing an indication of a respective non-linear (NL) transmission (TX) floor for each of the neighboring wireless communications devices, wherein selecting the second wireless communications device is further based on a respective NL TX floor associated with the second wireless communications device. In some cases, the operations of this step refer to, or may be performed by, circuitry for receiving and / or code for receiving as described with reference to FIG. 13.

[0178] In some aspects, transmitting the first message including the request comprises transmitting the first message to a network entity; the request in the first message requests that the network entity allocate time-frequency resources for the second wireless communications device to use to transmit a sounding reference signal (SRS); and the first message further includes one or more parameters for the second wireless communications device to use to transmit the SRS to the first wireless communications device.

[0179] In some aspects, the one or more parameters include at least one of: a nonlinear (NL) transmission (TX) floor for the second wireless communications device to use to transmit the SRS to the first wireless communications device; a transmission configuration indicator (TCI) state for the second wireless communications device to use to transmit the SRS to the first wireless communications device; a bandwidth for the second wireless communications device to use to transmit the SRS to the first wirelesscommunications device; a carrier frequency for the second wireless communications device to use to transmit the SRS to the first wireless communications device; or a transmission power for the second wireless communications device to use to transmit the SRS to the first wireless communications device.

[0180] In some aspects, receiving the signal comprises receiving the SRS from the second wireless communications device in accordance with the one or more parameters.

[0181] In some aspects, transmitting the first message including the request comprises transmitting the first message including the request to the second wireless communications device using a sidelink channel; and receiving the signal from the second wireless communications device comprises receiving the signal from the second wireless communications device using the sidelink channel.

[0182] In one aspect, method 1000, or any aspect related to it, may be performed by an apparatus, such as communications device 1300 of FIG. 13, which includes various components operable, configured, or adapted to perform the method 1000. Communications device 1300 is described below in further detail.

[0183] Note that FIG. 10 is just one example of a method, and other methods including fewer, additional, or alternative steps are possible consistent with this disclosure.Example Operations of a Second Wireless Communications Device

[0184] FIG. 11 shows an example of a method 1100 of wireless communication by a second wireless communications device. In some examples, the second wireless communications device is a user equipment, such as a UE 104 of FIGS. 1 and 3. In some examples, the second wireless communications device is a network entity, such as a BS 102 of FIGS. 1 and 3, or a disaggregated base station as discussed with respect to FIG. 2.

[0185] Method 1100 begins at step 1105 with receiving a first message including a request for the second wireless communications device to transmit a signal to a first wireless communications device, wherein the first message includes one or more parameters for the second wireless communications device to use to transmit the signal to the first wireless communications device, and the one or more parameters include a non-linear (NL) transmission (TX) floor for the signal. In some cases, the operations ofthis step refer to, or may be performed by, circuitry for receiving and / or code for receiving as described with reference to FIG. 14.

[0186] Method 1100 then proceeds to step 1110 with transmitting, to the first wireless communications device, the signal based on the first message and the one or more parameters. In some cases, the operations of this step refer to, or may be performed by, circuitry for transmitting and / or code for transmitting as described with reference to FIG.14

[0187] In some aspects, the signal comprises at least one of a signal that has a peak to average power ratio (PAPR) equal to or exceeding a threshold PAPR or a signal that has a predefined amplitude distribution.

[0188] In some aspects, the signal comprises a pre-configured payload; and the signal is transmitted in one of a control message or a data message.

[0189] In some aspects, the signal comprises one of a reference signal, a synchronization signal block (SSB), or a sounding reference signal (SRS).

[0190] In some aspects, the NL TX floor is indicated as an error vector magnitude (EVM).

[0191] In some aspects, the one or more parameters further include a transmission configuration indicator (TCI) state for the second wireless communications device to use to transmit the signal to the first wireless communications device; and the TCI state is associated with a transmit beam of the second wireless communications device and a corresponding receive beam of the first wireless communications device.

[0192] In some aspects, the one or more parameters further include at least one of: a bandwidth for the second wireless communications device to use to transmit the signal to the first wireless communications device; a carrier frequency for the second wireless communications device to use to transmit the signal to the first wireless communications device; or a transmission power for the second wireless communications device to use to transmit the signal to the first wireless communications device.

[0193] In some aspects, the method 1100 further includes transmitting, to the first wireless communications device, an indication of a non-linear (NL) transmission (TX) floor or error vector magnitude (EVM) associated with the signal transmitted to the first wireless communications device. In some cases, the operations of this step refer to, ormay be performed by, circuitry for transmitting and / or code for transmitting as described with reference to FIG. 14.

[0194] In some aspects, the NL TX floor comprises an actual NL TX floor used to transmit the signal.

[0195] In some aspects, the first message further includes a request for the actual NL TX floor used to transmit the signal; and transmitting the actual NL TX floor used to transmit the signal is based on the request for the actual NL TX floor used to transmit the signal.

[0196] In some aspects, receiving the first message including the request comprises receiving the first message including the request from a network entity; and the one or more parameters further include time-frequency resources for the second wireless communications device to use to transmit a sounding reference signal (SRS).

[0197] In some aspects, the method 1100 further includes transmitting feedback to the network entity indicating an actual NL TX floor used to transmit the signal. In some cases, the operations of this step refer to, or may be performed by, circuitry for transmitting and / or code for transmitting as described with reference to FIG. 14.

[0198] In some aspects, transmitting the signal comprises transmitting the SRS, in accordance with the one or more parameters, to the first wireless communications device using the indicated time-frequency resources.

[0199] In some aspects, the method 1100 further includes transmitting one or more crosslink interference (CLI) reports, wherein receiving the first message including the request is based on the transmitted one or more CLI reports. In some cases, the operations of this step refer to, or may be performed by, circuitry for transmitting and / or code for transmitting as described with reference to FIG. 14.

[0200] In some aspects, the method 1100 further includes transmitting an indication of a respective non-linear (NL) transmission (TX) floor associated with the second wireless communications device. In some cases, the operations of this step refer to, or may be performed by, circuitry for transmitting and / or code for transmitting as described with reference to FIG. 14.

[0201] In some aspects, receiving the first message including the request comprises receiving the first message including the request from the first wireless communicationsdevice using a sidelink channel; and transmitting the signal to the first wireless communications device comprises transmitting the signal to the first wireless communications device using the sidelink channel.

[0202] In one aspect, method 1100, or any aspect related to it, may be performed by an apparatus, such as communications device 1400 of FIG. 14, which includes various components operable, configured, or adapted to perform the method 1100. Communications device 1400 is described below in further detail.

[0203] Note that FIG. 11 is just one example of a method, and other methods including fewer, additional, or alternative steps are possible consistent with this disclosure.Example Operations of a Network Entity

[0204] FIG. 12 shows an example of a method 1200 of wireless communication by a network entity, such as a BS 102 of FIGS. 1 and 3, or a disaggregated base station as discussed with respect to FIG. 2.

[0205] Method 1200 begins at step 1205 with receiving, from a first wireless communications device, a first message including a request for a second wireless communications device to transmit a signal to the first wireless communications device. In some cases, the operations of this step refer to, or may be performed by, circuitry for receiving and / or code for receiving as described with reference to FIG. 15.

[0206] Method 1200 then proceeds to step 1210 with transmitting, to the second wireless communications device, a second message including the request for the second wireless communications device to transmit the signal to the first wireless communications device and one or more parameters for the second wireless communications device to use to transmit the signal to the first wireless communications device, wherein the one or more parameters include at least a non-linear (NL) transmission (TX) floor for the signal. In some cases, the operations of this step refer to, or may be performed by, circuitry for transmitting and / or code for transmitting as described with reference to FIG. 15.

[0207] In some aspects, the method 1200 further includes receiving feedback from the second wireless communications device indicating an actual NL TX floor used to transmit the signal. In some cases, the operations of this step refer to, or may be performedby, circuitry for receiving and / or code for receiving as described with reference to FIG.15

[0208] In some aspects, the one or more parameters include at least one of: a nonlinear (NL) transmission (TX) floor for the second wireless communications device to use to transmit the signal to the first wireless communications device; a transmission configuration indicator (TCI) state for the second wireless communications device to use to transmit the signal to the first wireless communications device; a bandwidth for the second wireless communications device to use to transmit the signal to the first wireless communications device; a carrier frequency for the second wireless communications device to use to transmit the signal to the first wireless communications device; or a transmission power for the second wireless communications device to use to transmit the signal to the first wireless communications device.

[0209] In some aspects, the one or more parameters are included in the first message received from the first wireless communications device.

[0210] In some aspects, the signal comprises a sounding reference signal (SRS).

[0211] In some aspects, the request in the first message requests that the network entity allocate time-frequency resources for the second wireless communications device to use to transmit the SRS; and the method further comprises allocating, based on the request, the time-frequency resources for the second wireless communications device to use to transmit the SRS to the first wireless communications device.

[0212] In some aspects, the method 1200 further includes receiving one or more CLI reports from the first wireless communications device associated with one or more neighboring wireless communications devices of the first wireless communications device, wherein the one or more CLI reports include at least one CLI report associated with the second wireless communications device. In some cases, the operations of this step refer to, or may be performed by, circuitry for receiving and / or code for receiving as described with reference to FIG. 15.

[0213] In some aspects, the method 1200 further includes selecting the second wireless communications device, from the one or more neighboring wireless communications devices of the first wireless communications device, based on the at least one CLI report associated with the second wireless communications device. In somecases, the operations of this step refer to, or may be performed by, circuitry for selecting and / or code for selecting as described with reference to FIG. 15.

[0214] In some aspects, the method 1200 further includes determining the one or more parameters for the second wireless communications device to use to transmit the signal to the first wireless communications device based on the at least one CLI report associated with the second wireless communications device. In some cases, the operations of this step refer to, or may be performed by, circuitry for determining and / or code for determining as described with reference to FIG. 15.

[0215] In some aspects, the one or more parameters in the second message include an indication of the time-frequency resources.

[0216] In some aspects, the method 1200 further includes transmitting, to the first wireless communications device, an indication of the time-frequency resources for the second wireless communications device to use to transmit the SRS and an indication of the NL transmission TX floor for the SRS. In some cases, the operations of this step refer to, or may be performed by, circuitry for transmitting and / or code for transmitting as described with reference to FIG. 15.

[0217] In some aspects, the signal comprises at least one of a signal that has a peak to average power ratio (PAPR) equal to or exceeding a threshold PAPR or a signal that has a predefined amplitude distribution.

[0218] In some aspects, the signal comprises a pre-configured payload; and the signal is transmitted in one of a control message or a data message.

[0219] In some aspects, the signal comprises one of a reference signal, a synchronization signal block (SSB), or a sounding reference signal (SRS).

[0220] In one aspect, method 1200, or any aspect related to it, may be performed by an apparatus, such as communications device 1500 of FIG. 15, which includes various components operable, configured, or adapted to perform the method 1200. Communications device 1500 is described below in further detail.

[0221] Note that FIG. 12 is just one example of a method, and other methods including fewer, additional, or alternative steps are possible consistent with this disclosure.Example Communications Device (s)

[0222] FIG. 13 depicts aspects of an example communications device 1300. In some aspects, communications device 1300 is a user equipment, such as UE 104 described above with respect to FIGS. 1 and 3.

[0223] The communications device 1300 includes a processing system 1305 coupled to the transceiver 1385 (e.g., a transmitter and / or a receiver). The transceiver 1385 is configured to transmit and receive signals for the communications device 1300 via the antenna 1390, such as the various signals as described herein. The processing system 1305 may be configured to perform processing functions for the communications device 1300, including processing signals received and / or to be transmitted by the communications device 1300.

[0224] The processing system 1305 includes one or more processors 1310. In various aspects, the one or more processors 1310 may be representative of one or more of receive processor 358, transmit processor 364, TX MIMO processor 366, and / or controller / processor 380, as described with respect to FIG. 3. The one or more processors 1310 are coupled to a computer-readable medium / memory 1345 via a bus 1380. In certain aspects, the computer-readable medium / memory 1345 is configured to store instructions (e.g., computer-executable code) that when executed by the one or more processors 1310, cause the one or more processors 1310 to perform the method 1000 described with respect to FIG. 10, or any aspect related to it; and the method 1100 described with respect to FIG. 11, or any aspect related to it. Note that reference to a processor performing a function of communications device 1300 may include one or more processors 1310 performing that function of communications device 1300.

[0225] In the depicted example, computer-readable medium / memory 1345 stores code (e.g., executable instructions), such as code for transmitting 1350, code for receiving 1355, code for determining 1360, code for taking 1365, code for selecting 1370, code for storing 1375, and code for linearizing 1377. Processing of the code for transmitting 1350, code for receiving 1355, code for determining 1360, code for taking 1365, code for selecting 1370, code for storing 1375, and code for linearizing 1377 may cause the communications device 1300 to perform the method 1000 described with respect to FIG. 10, or any aspect related to it; and the method 1100 described with respect to FIG. 11, or any aspect related to it.

[0226] The one or more processors 1310 include circuitry configured to implement (e.g., execute) the code stored in the computer-readable medium / memory 1345, including circuitry such as circuitry for transmitting 1315, circuitry for receiving 1320, circuitry for determining 1325, circuitry for taking 1330, circuitry for selecting 1335, circuitry for storing 1340, and circuitry for linearizing 1342. Processing with circuitry for transmitting 1315, circuitry for receiving 1320, circuitry for determining 1325, circuitry for taking 1330, circuitry for selecting 1335, circuitry for storing 1340, and circuitry for linearizing 1342 may cause the communications device 1300 to perform the method 1000 described with respect to FIG. 10, or any aspect related to it; and the method 1100 described with respect to FIG. 11, or any aspect related to it.

[0227] Various components of the communications device 1300 may provide means for performing the method 1000 described with respect to FIG. 10, or any aspect related to it; and the method 1100 described with respect to FIG. 11, or any aspect related to it. For example, means for transmitting, sending or outputting for transmission may include transceivers 354 and / or antenna(s) 352 of the UE 104 illustrated in FIG. 3 and / or the transceiver 1385 and the antenna 1390 of the communications device 1300 in FIG. 13. Means for receiving or obtaining may include transceivers 354 and / or antenna(s) 352 of the UE 104 illustrated in FIG. 3 and / or the transceiver 1385 and the antenna 1390 of the communications device 1300 in FIG. 13.

[0228] FIG. 14 depicts aspects of an example communications device 1400. In some aspects, communications device 1400 is a user equipment, such as UE 104 described above with respect to FIGS. 1 and 3. In some aspects, communications device 1400 is a network entity, such as BS 102 of FIGS. 1 and 3, or a disaggregated base station as discussed with respect to FIG. 2.

[0229] The communications device 1400 includes a processing system 1405 coupled to the transceiver 1445 (e.g., a transmitter and / or a receiver). In some aspects (e.g., when communications device 1400 is a network entity), processing system 1405 may be coupled to a network interface 1455 that is configured to obtain and send signals for the communications device 1400 via communication link(s), such as a backhaul link, midhaul link, and / or fronthaul link as described herein, such as with respect to FIG. 2. The transceiver 1445 is configured to transmit and receive signals for the communications device 1400 via the antenna 1450, such as the various signals as described herein. Theprocessing system 1405 may be configured to perform processing functions for the communications device 1400, including processing signals received and / or to be transmitted by the communications device 1400.

[0230] The processing system 1405 includes one or more processors 1410. In various aspects, the one or more processors 1410 may be representative of one or more of receive processor 358, transmit processor 364, TX MIMO processor 366, and / or controller / processor 380, as described with respect to FIG. 3. In various aspects, one or more processors 1410 may be representative of one or more of receive processor 338, transmit processor 320, TX MIMO processor 330, and / or controller / processor 340, as described with respect to FIG. 3. The one or more processors 1410 are coupled to a computer-readable medium / memory 1425 via a bus 1440. In certain aspects, the computer-readable medium / memory 1425 is configured to store instructions (e.g., computer-executable code) that when executed by the one or more processors 1410, cause the one or more processors 1410 to perform the method 1000 described with respect to FIG. 10, or any aspect related to it; the method 1100 described with respect to FIG. 11, or any aspect related to it; and the method 1200 described with respect to FIG. 12, or any aspect related to it. Note that reference to a processor performing a function of communications device 1400 may include one or more processors 1410 performing that function of communications device 1400.

[0231] In the depicted example, computer-readable medium / memory 1425 stores code (e.g., executable instructions), such as code for receiving 1430 and code for transmitting 1435. Processing of the code for receiving 1430 and code for transmitting 1435 may cause the communications device 1400 to perform the method 1000 described with respect to FIG. 10, or any aspect related to it; the method 1100 described with respect to FIG. 11, or any aspect related to it; and the method 1200 described with respect to FIG. 12, or any aspect related to it.

[0232] The one or more processors 1410 include circuitry configured to implement (e.g., execute) the code stored in the computer-readable medium / memory 1425, including circuitry for receiving 1415 and circuitry for transmitting 1420. Processing with circuitry for receiving 1415 and circuitry for transmitting 1420 may cause the communications device 1400 to perform the method 1000 described with respect to FIG. 10, or any aspectrelated to it; the method 1100 described with respect to FIG. 11, or any aspect related to it; and the method 1200 described with respect to FIG. 12, or any aspect related to it.

[0233] Various components of the communications device 1400 may provide means for performing the method 1000 described with respect to FIG. 10, or any aspect related to it; the method 1100 described with respect to FIG. 11, or any aspect related to it; and the method 1200 described with respect to FIG. 12, or any aspect related to it. For example, means for transmitting, sending or outputting for transmission may include transceivers 354 and / or antenna(s) 352 of the UE 104 illustrated in FIG. 3, transceivers 332 and / or antenna(s) 334 of the BS 102 illustrated in FIG. 3, and / or the transceiver 1445 and the antenna 1450 of the communications device 1400 in FIG. 14. Means for receiving or obtaining may include transceivers 354 and / or antenna(s) 352 of the UE 104 illustrated in FIG. 3, transceivers 332 and / or antenna(s) 334 of the BS 102 illustrated in FIG. 3, and / or the transceiver 1445 and the antenna 1450 of the communications device 1400 inFIG. 14

[0234] FIG. 15 depicts aspects of an example communications device 1500. In some aspects, communications device 1500 is a network entity, such as BS 102 of FIGS. 1 and 3, or a disaggregated base station as discussed with respect to FIG. 2.

[0235] The communications device 1500 includes a processing system 1505 coupled to the transceiver 1565 (e.g., a transmitter and / or a receiver) and / or a network interface 1575. The transceiver 1565 is configured to transmit and receive signals for the communications device 1500 via the antenna 1570, such as the various signals as described herein. The network interface 1575 is configured to obtain and send signals for the communications device 1500 via communication link(s), such as a backhaul link, midhaul link, and / or fronthaul link as described herein, such as with respect to FIG. 2. The processing system 1505 may be configured to perform processing functions for the communications device 1500, including processing signals received and / or to be transmitted by the communications device 1500.

[0236] The processing system 1505 includes one or more processors 1510. In various aspects, one or more processors 1510 may be representative of one or more of receive processor 338, transmit processor 320, TX MIMO processor 330, and / or controller / processor 340, as described with respect to FIG. 3. The one or more processors 1510 are coupled to a computer-readable medium / memory 1535 via a bus 1560. In certainaspects, the computer-readable medium / memory 1535 is configured to store instructions (e.g., computer-executable code) that when executed by the one or more processors 1510, cause the one or more processors 1510 to perform the method 1100 described with respect to FIG. 11, or any aspect related to it; and the method 1200 described with respect to FIG. 12, or any aspect related to it. Note that reference to a processor of communications device 1500 performing a function may include one or more processors 1510 of communications device 1500 performing that function.

[0237] In the depicted example, the computer-readable medium / memory 1535 stores code (e.g., executable instructions), such as code for receiving 1540, code for transmitting 1545, code for selecting 1550, code for determining 1555, and code for allocating 1557. Processing of the code for receiving 1540, code for transmitting 1545, code for selecting 1550, code for determining 1555, and code for allocating 1557 may cause the communications device 1500 to perform the method 1100 described with respect to FIG. 11, or any aspect related to it; and the method 1200 described with respect to FIG. 12, or any aspect related to it.

[0238] The one or more processors 1510 include circuitry configured to implement (e.g., execute) the code stored in the computer-readable medium / memory 1535, including circuitry such as circuitry for receiving 1515, circuitry for transmitting 1520, circuitry for selecting 1525, circuitry for determining 1530, and circuitry for allocating 1532. Processing with circuitry for receiving 1515, circuitry for transmitting 1520, circuitry for selecting 1525, circuitry for determining 1530, and circuitry for allocating 1532 may cause the communications device 1500 to perform the method 1100 described with respect to FIG. 11, or any aspect related to it; and the method 1200 described with respect to FIG. 12, or any aspect related to it.

[0239] Various components of the communications device 1500 may provide means for performing the method 1100 described with respect to FIG. 11, or any aspect related to it; and the method 1200 described with respect to FIG. 12, or any aspect related to it. Means for transmitting, sending or outputting for transmission may include transceivers 332 and / or antenna(s) 334 of the BS 102 illustrated in FIG. 3 and / or the transceiver 1565 and the antenna 1570 of the communications device 1500 in FIG. 15. Means for receiving or obtaining may include transceivers 332 and / or antenna(s) 334 of the BS 102 illustratedin FIG. 3 and / or the transceiver 1565 and the antenna 1570 of the communications device1500 in FIG. 15.Example Clauses

[0240] Implementation examples are described in the following numbered clauses:

[0241] Clause 1 : A method for wireless communication by a first wireless communications device, comprising: transmitting a first message including a request for a second wireless communications device to transmit a signal to the first wireless communications device; receiving, from the second wireless communications device, the signal based on the first message; determining a non-linear model of an analog front end (AFE) of the first wireless communications device based on the signal received from the second wireless communications device; and taking one or more actions based on the determined non-linear model of the AFE.

[0242] Clause 2: The method of Clause 1, wherein the signal comprises at least one of a signal that has a peak to average power ratio (PAPR) equal to or exceeding a threshold PAPR or a signal that has a predefined amplitude distribution.

[0243] Clause 3 : The method of any one of Clauses 1-2, wherein: the signal comprises a pre-configured payload; and the signal is received in one of a control message or a data message.

[0244] Clause 4: The method of Clause 3, wherein the signal comprises one of a reference signal, a synchronization signal block (SSB), or a sounding reference signal (SRS).

[0245] Clause 5: The method of any one of Clauses 1-4, wherein: the first message further includes one or more parameters for the second wireless communications device to use to transmit the signal to the first wireless communications device; and the signal is received in accordance with the one or more parameters.

[0246] Clause 6: The method of Clause 5, wherein the one or more parameters include a non-linear (NL) transmission (TX) floor for the second wireless communications device to use to transmit the signal to the first wireless communications device.

[0247] Clause 7: The method of Clause 6, wherein the NL TX floor is indicated as an error vector magnitude (EVM).

[0248] Clause 8: The method of Clause 5, wherein: the one or more parameters include a transmission configuration indicator (TCI) state for the second wireless communications device to use to transmit the signal to the first wireless communications device; and the TCI state is associated with a transmit beam of the second wireless communications device and a corresponding receive beam of the first wireless communications device.

[0249] Clause 9: The method of Clause 5, wherein the one or more parameters include at least one of: a bandwidth for the second wireless communications device to use to transmit the signal to the first wireless communications device; a carrier frequency for the second wireless communications device to use to transmit the signal to the first wireless communications device; or a transmission power for the second wireless communications device to use to transmit the signal to the first wireless communications device.

[0250] Clause 10: The method of any one of Clauses 1-9, further comprising receiving, from the second wireless communications device, an indication of a non-linear (NL) transmission (TX) floor or an error vector magnitude (EVM) associated with the signal received from the second wireless communications device.

[0251] Clause 11 : The method of Clause 10, wherein the NL TX floor comprises an actual NL TX floor used to transmit the signal.

[0252] Clause 12: The method of Clause 11, wherein: the first message further includes a request for the actual NL TX floor used to transmit the signal; and receiving the actual NL TX floor used to transmit the signal is based on the request for the actual NL TX floor used to transmit the signal.

[0253] Clause 13: The method of any one of Clauses 1-12, wherein taking the one or more actions comprises: determining a correction model based on the determined nonlinear model; and linearizing a non-linear response of the AFE based on the determined correction model.

[0254] Clause 14: The method of any one of Clauses 1-13, further comprising receiving one or more cross link interference (CLI) reports from one or more neighboring wireless communications devices, including the second wireless communications device.

[0255] Clause 15: The method of Clause 14, further comprising transmitting the one or more CLI reports to a network entity, wherein: the one or more CLI reports include atleast one CLI report associated with the second wireless communications device; and receiving the signal from the second wireless communications device is based on the one or more CLI reports transmitted to the network entity, including the at least one CLI report associated with the second wireless communications device.

[0256] Clause 16: The method of Clause 15, wherein: the signal comprises a sounding reference signal (SRS); and the method further comprises receiving, from the network entity, an indication of time-frequency resources for the second wireless communications device to use to transmit the SRS and an indication of a non-linear (NL) transmission (TX) floor for the SRS.

[0257] Clause 17: The method of Clause 14, further comprising: determining, based on the one or more CLI reports, a set of neighboring wireless communications devices, from the one or more neighboring wireless communications devices, that have a sufficient link budget for transmitting the signal to the first wireless communications device; and selecting the second wireless communications device from the set of neighboring wireless communications devices.

[0258] Clause 18: The method of Clause 17, further comprising storing parameters associated with the received one or more CLI reports, wherein selecting the second wireless communications device is based on the stored parameters associated with a CLI report, of the one or more CLI reports, received from the second wireless communications device.

[0259] Clause 19: The method of Clause 17, further comprising receiving and storing an indication of a respective non-linear (NL) transmission (TX) floor for each of the neighboring wireless communications devices, wherein selecting the second wireless communications device is further based on a respective NL TX floor associated with the second wireless communications device.

[0260] Clause 20: The method of Clause 17, wherein: transmitting the first message including the request comprises transmitting the first message to a network entity; the request in the first message requests that the network entity allocate time-frequency resources for the second wireless communications device to use to transmit a sounding reference signal (SRS); and the first message further includes one or more parameters for the second wireless communications device to use to transmit the SRS to the first wireless communications device.

[0261] Clause 21 : The method of Clause 20, wherein the one or more parameters include at least one of: a non-linear (NL) transmission (TX) floor for the second wireless communications device to use to transmit the SRS to the first wireless communications device; a transmission configuration indicator (TCI) state for the second wireless communications device to use to transmit the SRS to the first wireless communications device; a bandwidth for the second wireless communications device to use to transmit the SRS to the first wireless communications device; a carrier frequency for the second wireless communications device to use to transmit the SRS to the first wireless communications device; or a transmission power for the second wireless communications device to use to transmit the SRS to the first wireless communications device.

[0262] Clause 22: The method of Clause 20, wherein receiving the signal comprises receiving the SRS from the second wireless communications device in accordance with the one or more parameters.

[0263] Clause 23: The method of any one of Clauses 1-22, wherein: transmitting the first message including the request comprises transmitting the first message including the request to the second wireless communications device using a sidelink channel; and receiving the signal from the second wireless communications device comprises receiving the signal from the second wireless communications device using the sidelink channel.

[0264] Clause 24: A method for wireless communication by a second wireless communications device, comprising: receiving a first message including a request for the second wireless communications device to transmit a signal to a first wireless communications device, wherein the first message includes one or more parameters for the second wireless communications device to use to transmit the signal to the first wireless communications device, and the one or more parameters include a non-linear (NL) transmission (TX) floor for the signal; and transmitting, to the first wireless communications device, the signal based on the first message and the one or more parameters.

[0265] Clause 25: The method of Clause 24, wherein the signal comprises at least one of a signal that has a peak to average power ratio (PAPR) equal to or exceeding a threshold PAPR or a signal that has a predefined amplitude distribution.

[0266] Clause 26: The method of any one of Clauses 24-25, wherein: the signal comprises a pre-configured payload; and the signal is transmitted in one of a control message or a data message.

[0267] Clause 27: The method of Clause 26, wherein the signal comprises one of a reference signal, a synchronization signal block (SSB), or a sounding reference signal (SRS).

[0268] Clause 28: The method of any one of Clauses 24-27, wherein the NL TX floor is indicated as an error vector magnitude (EVM).

[0269] Clause 29: The method of any one of Clauses 24-28, wherein: the one or more parameters further include a transmission configuration indicator (TCI) state for the second wireless communications device to use to transmit the signal to the first wireless communications device; and the TCI state is associated with a transmit beam of the second wireless communications device and a corresponding receive beam of the first wireless communications device.

[0270] Clause 30: The method of any one of Clauses 24-29, wherein the one or more parameters further include at least one of: a bandwidth for the second wireless communications device to use to transmit the signal to the first wireless communications device; a carrier frequency for the second wireless communications device to use to transmit the signal to the first wireless communications device; or a transmission power for the second wireless communications device to use to transmit the signal to the first wireless communications device.

[0271] Clause 31 : The method of any one of Clauses 24-30, further comprising transmitting, to the first wireless communications device, an indication of a non-linear (NL) transmission (TX) floor or error vector magnitude (EVM) associated with the signal transmitted to the first wireless communications device.

[0272] Clause 32: The method of Clause 31, wherein the NL TX floor comprises an actual NL TX floor used to transmit the signal.

[0273] Clause 33: The method of Clause 32, wherein: the first message further includes a request for the actual NL TX floor used to transmit the signal; and transmitting the actual NL TX floor used to transmit the signal is based on the request for the actual NL TX floor used to transmit the signal.

[0274] Clause 34: The method of any one of Clauses 24-33, wherein: receiving the first message including the request comprises receiving the first message including the request from a network entity; and the one or more parameters further include timefrequency resources for the second wireless communications device to use to transmit a sounding reference signal (SRS).

[0275] Clause 35: The method of Clause 34, further comprising transmitting feedback to the network entity indicating an actual NL TX floor used to transmit the signal.

[0276] Clause 36: The method of Clause 34, wherein transmitting the signal comprises transmitting the SRS, in accordance with the one or more parameters, to the first wireless communications device using the indicated time-frequency resources.

[0277] Clause 37: The method of any one of Clauses 24-36, further comprising transmitting one or more crosslink interference (CLI) reports, wherein receiving the first message including the request is based on the transmitted one or more CLI reports.

[0278] Clause 38: The method of Clause 37, further comprising transmitting an indication of a respective non-linear (NL) transmission (TX) floor associated with the second wireless communications device.

[0279] Clause 39: The method of any one of Clauses 24-38, wherein: receiving the first message including the request comprises receiving the first message including the request from the first wireless communications device using a sidelink channel; and transmitting the signal to the first wireless communications device comprises transmitting the signal to the first wireless communications device using the sidelink channel.

[0280] Clause 40: A method for wireless communication by a network entity, comprising: receiving, from a first wireless communications device, a first message including a request for a second wireless communications device to transmit a signal to the first wireless communications device; and transmitting, to the second wireless communications device, a second message including the request for the second wireless communications device to transmit the signal to the first wireless communications device and one or more parameters for the second wireless communications device to use to transmit the signal to the first wireless communications device, wherein the one or more parameters include at least a non-linear (NL) transmission (TX) floor for the signal.

[0281] Clause 41: The method of Clause 40, further comprising receiving feedback from the second wireless communications device indicating an actual NL TX floor used to transmit the signal.

[0282] Clause 42: The method of any one of Clauses 40-41, wherein the one or more parameters include at least one of: a non-linear (NL) transmission (TX) floor for the second wireless communications device to use to transmit the signal to the first wireless communications device; a transmission configuration indicator (TCI) state for the second wireless communications device to use to transmit the signal to the first wireless communications device; a bandwidth for the second wireless communications device to use to transmit the signal to the first wireless communications device; a carrier frequency for the second wireless communications device to use to transmit the signal to the first wireless communications device; or a transmission power for the second wireless communications device to use to transmit the signal to the first wireless communications device.

[0283] Clause 43 : The method of any one of Clauses 40-42, wherein the one or more parameters are included in the first message received from the first wireless communications device.

[0284] Clause 44: The method of any one of Clauses 40-43, wherein the signal comprises a sounding reference signal (SRS).

[0285] Clause 45: The method of Clause 44, wherein: the request in the first message requests that the network entity allocate time-frequency resources for the second wireless communications device to use to transmit the SRS; and the method further comprises allocating, based on the request, the time-frequency resources for the second wireless communications device to use to transmit the SRS to the first wireless communications device.

[0286] Clause 46: The method of Clause 45, further comprising receiving one or more CLI reports from the first wireless communications device associated with one or more neighboring wireless communications devices of the first wireless communications device, wherein the one or more CLI reports include at least one CLI report associated with the second wireless communications device.

[0287] Clause 47: The method of Clause 45, further comprising selecting the second wireless communications device, from the one or more neighboring wireless communications devices of the first wireless communications device, based on the at least one CLI report associated with the second wireless communications device.

[0288] Clause 48: The method of Clause 47, further comprising determining the one or more parameters for the second wireless communications device to use to transmit the signal to the first wireless communications device based on the at least one CLI report associated with the second wireless communications device.

[0289] Clause 49: The method of Clause 45, wherein the one or more parameters in the second message include an indication of the time-frequency resources.

[0290] Clause 50: The method of Clause 45, further comprising transmitting, to the first wireless communications device, an indication of the time-frequency resources for the second wireless communications device to use to transmit the SRS and an indication of the NL transmission TX floor for the SRS.

[0291] Clause 51 : The method of any one of Clauses 40-50, wherein the signal comprises at least one of a signal that has a peak to average power ratio (PAPR) equal to or exceeding a threshold PAPR or a signal that has a predefined amplitude distribution.

[0292] Clause 52: The method of any one of Clauses 40-51, wherein: the signal comprises a pre-configured payload; and the signal is transmitted in one of a control message or a data message.

[0293] Clause 53: The method of Clause 52, wherein the signal comprises one of a reference signal, a synchronization signal block (SSB), or a sounding reference signal (SRS).

[0294] Clause 54: An apparatus, comprising: one or more memories comprising executable instructions; and one or more processors configured to execute the executable instructions and cause the apparatus to perform a method in accordance with any one of Clauses 1-53.

[0295] Clause 55: An apparatus, comprising means for performing a method in accordance with any one of Clauses 1-53.

[0296] Clause 56: A non-transitory computer-readable medium comprising executable instructions that, when executed by one or more processors of an apparatus, cause the apparatus to perform a method in accordance with any one of Clauses 1-53.

[0297] Clause 57: A computer program product embodied on a computer-readable storage medium comprising code for performing a method in accordance with any one of Clauses 1-53.Additional Considerations

[0298] The preceding description is provided to enable any person skilled in the art to practice the various aspects described herein. The examples discussed herein are not limiting of the scope, applicability, or aspects set forth in the claims. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects. For example, changes may be made in the function and arrangement of elements discussed without departing from the scope of the disclosure. Various examples may omit, substitute, or add various procedures or components as appropriate. For instance, the methods described may be performed in an order different from that described, and various actions may be added, omitted, or combined. Also, features described with respect to some examples may be combined in some other examples. For example, an apparatus may be implemented or a method may be practiced using any number of the aspects set forth herein. In addition, the scope of the disclosure is intended to cover such an apparatus or method that is practiced using other structure, functionality, or structure and functionality in addition to, or other than, the various aspects of the disclosure set forth herein. It should be understood that any aspect of the disclosure disclosed herein may be embodied by one or more elements of a claim.

[0299] The various illustrative logical blocks, modules and circuits described in connection with the present disclosure may be implemented or performed with a general purpose processor, a digital signal processor (DSP), an ASIC, a field programmable gate array (FPGA) or other programmable logic device (PLD), discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general-purpose processor may be a microprocessor, but in the alternative, the processor may be any commercially available processor, controller, microcontroller, or state machine. A processor may also be implemented as a combinationof computing devices, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, a system on a chip (SoC), or any other such configuration.

[0300] As used herein, a phrase referring to “at least one of’ a list of items refers to any combination of those items, including single members. As an example, “at least one of: a, b, or c” is intended to cover a, b, c, a-b, a-c, b-c, and a-b-c, as well as any combination with multiples of the same element (e.g., a-a, a-a-a, a-a-b, a-a-c, a-b-b, a-c-c, b-b, b-b-b, b-b-c, c-c, and c-c-c or any other ordering of a, b, and c).

[0301] As used herein, the term “determining” encompasses a wide variety of actions. For example, “determining” may include calculating, computing, processing, deriving, investigating, looking up (e.g., looking up in a table, a database or another data structure), ascertaining and the like. Also, “determining” may include receiving (e.g., receiving information), accessing (e.g., accessing data in a memory) and the like. Also, “determining” may include resolving, selecting, choosing, establishing and the like.

[0302] The methods disclosed herein comprise one or more actions for achieving the methods. The method actions may be interchanged with one another without departing from the scope of the claims. In other words, unless a specific order of actions is specified, the order and / or use of specific actions may be modified without departing from the scope of the claims. Further, the various operations of methods described above may be performed by any suitable means capable of performing the corresponding functions. The means may include various hardware and / or software component(s) and / or module(s), including, but not limited to a circuit, an application specific integrated circuit (ASIC), or processor.

[0303] The following claims are not intended to be limited to the aspects shown herein, but are to be accorded the full scope consistent with the language of the claims. Within a claim, reference to an element in the singular is not intended to mean “one and only one” unless specifically so stated, but rather “one or more.” Unless specifically stated otherwise, the term “some” refers to one or more. No claim element is to be construed under the provisions of 35 U.S.C. §112(f) unless the element is expressly recited using the phrase “means for”. All structural and functional equivalents to the elements of the various aspects described throughout this disclosure that are known or later come to be known to those of ordinary skill in the art are expressly incorporated herein by referenceand are intended to be encompassed by the claims. Moreover, nothing disclosed herein is intended to be dedicated to the public regardless of whether such disclosure is explicitly recited in the claims.

Claims

WHAT IS CLAIMED IS:

1. A method for wireless communication by a first wireless communications device, comprising: transmitting a first message including a request for a second wireless communications device to transmit a signal to the first wireless communications device; receiving, from the second wireless communications device, the signal based on the first message; determining a non-linear model of an analog front end (AFE) of the first wireless communications device based on the signal received from the second wireless communications device; and taking one or more actions based on the determined non-linear model of the AFE.

2. The method of claim 1, wherein the signal comprises at least one of a signal that has a peak to average power ratio (PAPR) equal to or exceeding a threshold PAPR or a signal that has a predefined amplitude distribution.

3. The method of claim 1, wherein: the signal comprises a pre-configured payload; and the signal is received in one of a control message or a data message.

4. The method of claim 3, wherein the signal comprises one of a reference signal, a synchronization signal block (SSB), or a sounding reference signal (SRS).

5. The method of claim 1, wherein: the first message further includes one or more parameters for the second wireless communications device to use to transmit the signal to the first wireless communications device; and the signal is received in accordance with the one or more parameters.

6. The method of claim 5, wherein the one or more parameters include a non-linear (NL) transmission (TX) floor for the second wireless communications device to use to transmit the signal to the first wireless communications device.

7. The method of claim 6, wherein the NL TX floor is indicated as an error vector magnitude (EVM).

8. The method of claim 5, wherein: the one or more parameters include a transmission configuration indicator (TCI) state for the second wireless communications device to use to transmit the signal to the first wireless communications device; and the TCI state is associated with a transmit beam of the second wireless communications device and a corresponding receive beam of the first wireless communications device.

9. The method of claim 5, wherein the one or more parameters include at least one of: a bandwidth for the second wireless communications device to use to transmit the signal to the first wireless communications device; a carrier frequency for the second wireless communications device to use to transmit the signal to the first wireless communications device; or a transmission power for the second wireless communications device to use to transmit the signal to the first wireless communications device.

10. The method of claim 1, further comprising receiving, from the second wireless communications device, an indication of a non-linear (NL) transmission (TX) floor or an error vector magnitude (EVM) associated with the signal received from the second wireless communications device.

11. The method of claim 10, wherein the NL TX floor comprises an actual NL TX floor used to transmit the signal.

12. The method of claim 11, wherein: the first message further includes a request for the actual NL TX floor used to transmit the signal; and receiving the actual NL TX floor used to transmit the signal is based on the request for the actual NL TX floor used to transmit the signal.

13. The method of claim 1, wherein taking the one or more actions comprises: determining a correction model based on the determined non-linear model; and linearizing a non-linear response of the AFE based on the determined correction model.

14. The method of claim 1, further comprising receiving one or more cross link interference (CLI) reports from one or more neighboring wireless communications devices, including the second wireless communications device.

15. The method of claim 14, further comprising transmitting the one or more CLI reports to a network entity, wherein: the one or more CLI reports include at least one CLI report associated with the second wireless communications device; and receiving the signal from the second wireless communications device is based on the one or more CLI reports transmitted to the network entity, including the at least one CLI report associated with the second wireless communications device.

16. The method of claim 15, wherein: the signal comprises a sounding reference signal (SRS); and the method further comprises receiving, from the network entity, an indication of time-frequency resources for the second wireless communications device to use to transmit the SRS and an indication of a non-linear (NL) transmission (TX) floor for the SRS.

17. The method of claim 14, further comprising: determining, based on the one or more CLI reports, a set of neighboring wireless communications devices, from the one or more neighboring wireless communications devices, that have a sufficient link budget for transmitting the signal to the first wireless communications device; and selecting the second wireless communications device from the set of neighboring wireless communications devices.

18. The method of claim 17, further comprising storing parameters associated with the received one or more CLI reports, wherein selecting the second wirelesscommunications device is based on the stored parameters associated with a CLI report, of the one or more CLI reports, received from the second wireless communications device.

19. The method of claim 17, further comprising receiving and storing an indication of a respective non-linear (NL) transmission (TX) floor for each of the neighboring wireless communications devices, wherein selecting the second wireless communications device is further based on a respective NL TX floor associated with the second wireless communications device.

20. The method of claim 17, wherein: transmitting the first message including the request comprises transmitting the first message to a network entity; the request in the first message requests that the network entity allocate timefrequency resources for the second wireless communications device to use to transmit a sounding reference signal (SRS); and the first message further includes one or more parameters for the second wireless communications device to use to transmit the SRS to the first wireless communications device.

21. The method of claim 20, wherein the one or more parameters include at least one of: a non-linear (NL) transmission (TX) floor for the second wireless communications device to use to transmit the SRS to the first wireless communications device; a transmission configuration indicator (TCI) state for the second wireless communications device to use to transmit the SRS to the first wireless communications device; a bandwidth for the second wireless communications device to use to transmit the SRS to the first wireless communications device; a carrier frequency for the second wireless communications device to use to transmit the SRS to the first wireless communications device; or a transmission power for the second wireless communications device to use to transmit the SRS to the first wireless communications device.

22. The method of claim 20, wherein receiving the signal comprises receiving the SRS from the second wireless communications device in accordance with the one or more parameters.

23. The method of claim 1, wherein: transmitting the first message including the request comprises transmitting the first message including the request to the second wireless communications device using a sidelink channel; and receiving the signal from the second wireless communications device comprises receiving the signal from the second wireless communications device using the sidelink channel.

24. An apparatus for wireless communication by a first wireless communications device, comprising: one or more memories comprising executable instructions; and one or more processors configured to execute the executable instructions and cause the first wireless communications device to: transmit a first message including a request for a second wireless communications device to transmit a signal to the first wireless communications device; receive, from the second wireless communications device, the signal based on the first message; determine a non-linear model of an analog front end (AFE) of the first wireless communications device based on the signal received from the second wireless communications device; and take one or more actions based on the determined non-linear model of the AFE.

25. The apparatus of claim 24, wherein: the first message further includes one or more parameters for the second wireless communications device to use to transmit the signal to the first wireless communications device; and the signal is received in accordance with the one or more parameters.

26. The apparatus of claim 25, wherein the one or more parameters include at least one of: a non-linear (NL) transmission (TX) floor for the second wireless communications device to use to transmit the SRS to the first wireless communications device; a transmission configuration indicator (TCI) state for the second wireless communications device to use to transmit the SRS to the first wireless communications device; a bandwidth for the second wireless communications device to use to transmit the SRS to the first wireless communications device; a carrier frequency for the second wireless communications device to use to transmit the SRS to the first wireless communications device; or a transmission power for the second wireless communications device to use to transmit the SRS to the first wireless communications device.

27. The apparatus of claim 24, wherein, in order to take the one or more actions, the one or more processors are further configured to cause the first wireless communications device to: determine a correction model based on the determined non-linear model; and linearize a non-linear response of the AFE based on the determined correction model.

28. The apparatus of claim 24, wherein the one or more processors are further configured to cause the first wireless communications device to: receive one or more cross link interference (CLI) reports from one or more neighboring wireless communications devices, including the second wireless communications device; determine, based on the one or more CLI reports, a set of neighboring wireless communications devices, from the one or more neighboring wireless communications devices, that have a sufficient link budget for transmitting the signal to the first wireless communications device; and select the second wireless communications device from the set of neighboring wireless communications devices.

29. An apparatus for wireless communication by a first wireless communications device, comprising: means for transmitting a first message including a request for a second wireless communications device to transmit a signal to the first wireless communications device; means for receiving, from the second wireless communications device, the signal based on the first message; means for determining a non-linear model of an analog front end (AFE) of the first wireless communications device based on the signal received from the second wireless communications device; and means for taking one or more actions based on the determined non-linear model of the AFE.

30. A non-transitory computer readable medium for wireless communication by a first wireless communications device, comprising: instructions that, when executed by one or more processors of a first wireless communications device, cause the first wireless communications device to: transmit a first message including a request for a second wireless communications device to transmit a signal to the first wireless communications device; receive, from the second wireless communications device, the signal based on the first message; determine a non-linear model of an analog front end (AFE) of the first wireless communications device based on the signal received from the second wireless communications device; and take one or more actions based on the determined non-linear model of the AFE.

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